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Fair Value Measurements - Changes in Financial Instruments Measured at Level 3 (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Contingent consideration    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period $ 44,983,000  
Accretion 3,781,000  
TRA payment to Dow (3,900,000)  
Tecnidex acquisition (312,000)  
Interest rate contract (456,000)  
Stock compensation expense 96,000  
Mark-to-market adjustment (2,796,000)  
Balance, end of period 41,396,000 $ 44,983,000
Contingent consideration | Tax amortization benefit contingency    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period 43,382,000  
Accretion 3,781,000  
TRA payment to Dow (3,900,000)  
Tecnidex acquisition 0  
Interest rate contract 0  
Stock compensation expense 0  
Mark-to-market adjustment (2,796,000)  
Balance, end of period 40,467,000 43,382,000
Contingent consideration | Contingent consideration related to acquisition    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period 691,000  
Accretion 0  
TRA payment to Dow 0  
Tecnidex acquisition (312,000)  
Interest rate contract 0  
Stock compensation expense 0  
Mark-to-market adjustment 0  
Balance, end of period 379,000 691,000
Contingent consideration | Interest rate contract    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period 456,000  
Accretion 0  
TRA payment to Dow 0  
Tecnidex acquisition 0  
Interest rate contract (456,000)  
Stock compensation expense 0  
Mark-to-market adjustment 0  
Balance, end of period 0 456,000
Contingent consideration | Stock appreciation rights    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period 268,000  
Accretion 0  
TRA payment to Dow 0  
Tecnidex acquisition 0  
Interest rate contract 0  
Stock compensation expense (122,000)  
Mark-to-market adjustment 0  
Balance, end of period 146,000 268,000
Contingent consideration | Phantom shares    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period 186,000  
Accretion 0  
TRA payment to Dow 0  
Tecnidex acquisition 0  
Interest rate contract 0  
Stock compensation expense 218,000  
Mark-to-market adjustment 0  
Balance, end of period 404,000 186,000
Contingent consideration | Tecnidex Fruit Protection, S.A.U. | Contingent consideration related to acquisition    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Tecnidex acquisition 300,000  
Term Loan | Level 2    
Financial instruments measured at Level 3 fair value on a recurring basis    
Fair value of long-term debt 397,100,000 408,200,000
Recurring    
Financial instruments measured at Level 3 fair value on a recurring basis    
Transfers between Level 1 to Level 2 0 0
Transfers between Level 2 to Level 1 0 0
Transfers out of Level 3 $ 0 $ 0