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Fair Value Measurements - Changes of Level 3 Financial Instruments (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Contingent consideration  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period $ 44,985
Accretion 1,108
Stock compensation expense 8
Mark-to-market adjustment (2,562)
Balance, ending period 43,539
Contingent consideration | Tax amortization benefit contingency  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 43,382
Accretion 1,108
Stock compensation expense 0
Mark-to-market adjustment 0
Balance, ending period 44,490
Contingent consideration | Contingent consideration related to acquisition  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 693
Accretion 0
Stock compensation expense 0
Mark-to-market adjustment 138
Balance, ending period 831
Contingent consideration | Interest rate contract  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 456
Accretion 0
Stock compensation expense 0
Mark-to-market adjustment (2,700)
Balance, ending period (2,244)
Contingent consideration | Stock appreciation rights  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 268
Accretion 0
Stock compensation expense (92)
Mark-to-market adjustment 0
Balance, ending period 176
Contingent consideration | Phantom shares  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 186
Accretion 0
Stock compensation expense 100
Mark-to-market adjustment 0
Balance, ending period 286
Term loan | Level 2  
Financial instruments measured at Level 3 fair value on a recurring basis  
Fair value of debt $ 417,500