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Schedule of Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jan. 19, 2018
Dec. 22, 2017
Assets          
Cash and cash equivalents $ 135,736 $ 120,221 $ 162,882    
Liabilities          
Senior notes       $ 100,000 $ 300,000
USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan 615,625 637,813      
Line of Credit [Member]          
Liabilities          
Multicurrency revolving line of credit 0 0      
Reported Value Measurement [Member]          
Assets          
Cash and cash equivalents 135,736 120,221      
Restricted cash 2,117 2,107      
Foreign exchange forwards 15 157      
Liabilities          
Senior notes 400,000 400,000      
Foreign exchange forwards 70 337      
Reported Value Measurement [Member] | USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan 615,625 637,813      
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 671 0      
Reported Value Measurement [Member] | Interest Rate Swap [Member]          
Assets          
Derivative asset, noncurrent 692 2,612      
Reported Value Measurement [Member] | Interest Rate Cap [Member]          
Assets          
Derivative asset, noncurrent 130 786      
Reported Value Measurement [Member] | Currency Swap [Member]          
Assets          
Derivative asset, noncurrent 3,218 2,970      
Estimate of Fair Value Measurement [Member]          
Assets          
Cash and cash equivalents 135,736 120,221      
Restricted cash 2,117 2,107      
Foreign exchange forwards 15 157      
Liabilities          
Senior notes 408,000 368,000      
Foreign exchange forwards 70 337      
Estimate of Fair Value Measurement [Member] | USD Denominated Term Loan [Member]          
Liabilities          
USD denominated term loan, fair value 609,865 630,971      
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 671 0      
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]          
Assets          
Derivative asset, noncurrent 692 2,612      
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member]          
Assets          
Derivative asset, noncurrent 130 786      
Estimate of Fair Value Measurement [Member] | Currency Swap [Member]          
Assets          
Derivative asset, noncurrent $ 3,218 $ 2,970