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Financial Instruments and Fair Value Measurements - Schedule of Fair Value Measurement Information about Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Term loans $ 990,000 $ 992,000
Revolving credit facility 145,000  
Finance lease liabilities 7,548 7,127
Notes payable 257 1,111
Long-term Debt 1,114,868 971,043
Carrying Amount [Member]    
Debt Instrument [Line Items]    
Long-term Debt 1,142,805 1,000,238
Carrying Amount [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Term loans 990,000 992,000
Revolving credit facility 145,000  
Carrying Amount [Member] | Level 3 [Member]    
Debt Instrument [Line Items]    
Finance lease liabilities 7,548 7,127
Notes payable 257 1,111
Fair Value [Member]    
Debt Instrument [Line Items]    
Long-term Debt 1,133,305 960,538
Fair Value [Member] | Level 2 [Member]    
Debt Instrument [Line Items]    
Term loans 981,600 952,300
Revolving credit facility 143,900  
Fair Value [Member] | Level 3 [Member]    
Debt Instrument [Line Items]    
Finance lease liabilities 7,548 7,127
Notes payable $ 257 $ 1,111