Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Valuation Inputs (Details)

v3.6.0.2
Fair Value Measurements - Valuation Inputs (Details) - Recurring - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value, measurement with unobservable inputs on recurring basis   $ 0
Contingent Consideration    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Volatility rates 29.90%  
Risk free rate of return 0.70%  
Contingent Consideration | Minimum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Discount rates 14.80% 15.80%
Volatility rates   37.00%
Risk free rate of return   0.50%
Contingent Consideration | Maximum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Discount rates 27.80% 60.00%
Volatility rates   53.50%
Risk free rate of return   0.90%
Swap Agreements    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair value, measurement with unobservable inputs on recurring basis $ 1,098