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Fair Value Measurements - Changes of Level 3 Financial Instruments (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Contingent consideration  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period $ 44,983
Accretion 2,894
Tecnidex acquisition 524
Interest rate contract (456)
Stock compensation expense (23)
Balance, ending period 47,922
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 2,894
Tecnidex acquisition 0
Interest rate contract 0
Stock compensation expense 0
Balance, ending period 46,276
Contingent consideration | Contingent consideration related to acquisition  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 691
Accretion 0
Tecnidex acquisition 524
Interest rate contract
Stock compensation expense 0
Balance, ending period 1,215
Contingent consideration | Interest rate swap  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 456
Accretion 0
Tecnidex acquisition 0
Interest rate contract (456)
Stock compensation expense 0
Balance, ending period 0
Contingent consideration | Stock appreciation rights  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 268
Accretion 0
Tecnidex acquisition 0
Interest rate contract 0
Stock compensation expense (160)
Balance, ending period 108
Contingent consideration | Phantom shares  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 186
Accretion 0
Tecnidex acquisition 0
Interest rate contract 0
Stock compensation expense 137
Balance, ending period 323
Term loan  
Financial instruments measured at Level 3 fair value on a recurring basis  
Fair value of debt $ 410,700