Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Valuation Inputs (Details)

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Fair Value Measurements - Valuation Inputs (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Discount rates 2.20%  
Contingent Consideration | Recurring | Minimum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Discount rates 15.80% 22.50%
Volatility rates 37.00% 45.00%
Risk free rate of return 0.50% 0.10%
Contingent Consideration | Recurring | Maximum    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Discount rates 60.00% 64.00%
Volatility rates 53.50% 48.00%
Risk free rate of return 0.90% 0.20%