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Schedule of Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jan. 19, 2018
Dec. 22, 2017
Assets          
Cash and cash equivalents $ 140,938 $ 120,221 $ 109,044    
Liabilities          
Senior notes       $ 100,000 $ 300,000
USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan 587,500 637,813      
Line of Credit [Member]          
Liabilities          
Multicurrency revolving line of credit 0 0      
Reported Value Measurement [Member]          
Assets          
Cash and cash equivalents 140,938 120,221      
Restricted cash 762 2,107      
Foreign exchange forwards 57 157      
Liabilities          
Senior notes 400,000 400,000      
Foreign exchange forwards 100 337      
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan 587,500 637,813      
Reported Value Measurement [Member] | Line of Credit [Member]          
Liabilities          
Multicurrency revolving line of credit 0 0      
Reported Value Measurement [Member] | Foreign Exchange Option [Member]          
Assets          
Derivative asset, noncurrent 493 0      
Reported Value Measurement [Member] | Interest Rate Swap [Member]          
Assets          
Derivative asset, noncurrent 346 2,612      
Reported Value Measurement [Member] | Interest Rate Cap [Member]          
Assets          
Derivative asset, noncurrent 43 786      
Reported Value Measurement [Member] | Currency Swap [Member]          
Assets          
Derivative asset, noncurrent 5,375 2,970      
Estimate of Fair Value Measurement [Member]          
Assets          
Cash and cash equivalents 140,938 120,221      
Restricted cash 762 2,107      
Foreign exchange forwards 57 157      
Liabilities          
Senior notes 412,000 368,000      
Foreign exchange forwards 100 337      
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan, fair value 582,339 630,971      
Estimate of Fair Value Measurement [Member] | Line of Credit [Member]          
Liabilities          
Multicurrency revolving line of credit, fair value 0 0      
Estimate of Fair Value Measurement [Member] | Foreign Exchange Option [Member]          
Assets          
Derivative asset, noncurrent 493 0      
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]          
Assets          
Derivative asset, noncurrent 346 2,612      
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]          
Assets          
Derivative asset, noncurrent 43 786      
Estimate of Fair Value Measurement [Member] | Currency Swap [Member]          
Assets          
Derivative asset, noncurrent $ 5,375 $ 2,970