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Schedule of Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Jan. 19, 2018
Dec. 22, 2017
Assets          
Cash and cash equivalents $ 110,828 $ 120,221 $ 143,951    
Liabilities          
Senior notes       $ 100,000 $ 300,000
USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan 623,750 637,813      
Line of Credit [Member]          
Liabilities          
Multicurrency revolving line of credit 0 0      
Reported Value Measurement [Member]          
Assets          
Cash and cash equivalents 110,828 120,221      
Restricted cash 2,137 2,107      
Foreign exchange forwards 94 157      
Liabilities          
Senior notes 400,000 400,000      
Foreign exchange forwards 127 337      
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan 623,750 637,813      
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   0      
Reported Value Measurement [Member] | Interest Rate Swap [Member]          
Assets          
Derivative asset, noncurrent 1,827 2,612      
Reported Value Measurement [Member] | Interest Rate Cap [Member]          
Assets          
Derivative asset, noncurrent 487 786      
Reported Value Measurement [Member] | Currency Swap [Member]          
Assets          
Derivative asset, noncurrent 4,195 2,970      
Estimate of Fair Value Measurement [Member]          
Assets          
Cash and cash equivalents 110,828 120,221      
Restricted cash 2,137 2,107      
Foreign exchange forwards 94 157      
Liabilities          
Senior notes 393,500 368,000      
Foreign exchange forwards 127 337      
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan, fair value 622,644 630,971      
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 1,407 0      
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]          
Assets          
Derivative asset, noncurrent 1,827 2,612      
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]          
Assets          
Derivative asset, noncurrent 487 786      
Estimate of Fair Value Measurement [Member] | Currency Swap [Member]          
Assets          
Derivative asset, noncurrent $ 4,195 $ 2,970