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Fair Value of Financial Instruments (Details)
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Jul. 31, 2019
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Fair Value of Financial Instruments [Abstract]              
Note payable $ 324,740 $ 324,740     $ 198,000    
Foreign Exchange Contracts [Member]              
Fair Value of Financial Instruments [Abstract]              
Notional amount 0 0 € 0.0     € 1.5  
Gain on fair value 0 100          
Fair value 0 0          
Interest Rate Swap [Member]              
Fair Value of Financial Instruments [Abstract]              
Notional amount 70,000 70,000     70,000   $ 70,000
Fair value 3,100 3,100     900    
Note Payable - IVG [Member]              
Fair Value of Financial Instruments [Abstract]              
Note payable $ 4,240 $ 4,240     4,000    
Interest rate 6.00% 6.00% 6.00%        
2018 First Lien Term Loan [Member]              
Fair Value of Financial Instruments [Abstract]              
Note payable $ 148,000 $ 148,000     154,000    
2018 Second Lien Term Loan [Member]              
Fair Value of Financial Instruments [Abstract]              
Note payable 0 0     40,000    
2.5% Convertible Senior Notes [Member]              
Fair Value of Financial Instruments [Abstract]              
Note payable $ 172,500 $ 172,500     0    
Interest rate 2.50% 2.50% 2.50% 2.50%      
Fair Value [Member] | 2018 First Lien Term Loan [Member]              
Fair Value of Financial Instruments [Abstract]              
Long-term debt $ 148,000 $ 148,000     154,000    
Fair Value [Member] | 2018 Second Lien Term Loan [Member]              
Fair Value of Financial Instruments [Abstract]              
Long-term debt         $ 40,000    
Fair Value [Member] | 2.5% Convertible Senior Notes [Member]              
Fair Value of Financial Instruments [Abstract]              
Long-term debt $ 169,500 $ 169,500