Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Contingent Consideration (Details)

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Fair Value Measurements - Contingent Consideration (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Contingent Consideration | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value $ 659 $ 841 $ 5,532 $ 4,150
Recurring        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 1,201      
Recurring | Level 1        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 0      
Recurring | Level 2        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 542      
Recurring | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 659      
Recurring | Contingent Consideration        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   841    
Recurring | Contingent Consideration | Level 1        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   0    
Recurring | Contingent Consideration | Level 2        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   0    
Recurring | Contingent Consideration | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   841    
Recurring | Contingent Consideration | Indatus        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 414 814    
Recurring | Contingent Consideration | Indatus | Level 1        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 0 0    
Recurring | Contingent Consideration | Indatus | Level 2        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 0 0    
Recurring | Contingent Consideration | Indatus | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 414 814    
Recurring | Contingent Consideration | AssetEye        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 245      
Recurring | Contingent Consideration | AssetEye | Level 1        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 0      
Recurring | Contingent Consideration | AssetEye | Level 2        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 0      
Recurring | Contingent Consideration | AssetEye | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 245      
Recurring | Contingent Consideration | VRX        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   27    
Recurring | Contingent Consideration | VRX | Level 1        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   0    
Recurring | Contingent Consideration | VRX | Level 2        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   0    
Recurring | Contingent Consideration | VRX | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value   $ 27    
Recurring | Derivative Financial Instruments | Interest rate swap agreements        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 542      
Recurring | Derivative Financial Instruments | Interest rate swap agreements | Level 1        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value 0      
Recurring | Derivative Financial Instruments | Interest rate swap agreements | Level 3        
Business Acquisition, Contingent Consideration [Line Items]        
Liabilities measured at fair value $ 542