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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 22, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2020
Mar. 31, 2020
Aug. 31, 2019
Jun. 30, 2019
Derivative Financial Instruments                
Repayment of borrowings   $ 526,510 $ 802,750 $ 274,000        
Interest expense   155,411 $ 114,703 $ 108,034        
Reclassification out of Accumulated Other Comprehensive Income                
Derivative Financial Instruments                
Interest expense $ 14,900              
Second Amended and Restated Term Loan B                
Derivative Financial Instruments                
Repayment of borrowings $ 315,000              
Interest Rate Swap                
Derivative Financial Instruments                
Notional amount               $ 300,000
Interest Rate Swap | Second Amended and Restated Term Loan B                
Derivative Financial Instruments                
Notional amount             $ 400,000 $ 300,000
Modified June 2019 Swap Agreement                
Derivative Financial Instruments                
Notional amount   100,000       $ 100,000    
Unmodified June 2019 Swap Agreements                
Derivative Financial Instruments                
Notional amount   $ 200,000       $ 200,000    
April 2020 Counter-agreements                
Derivative Financial Instruments                
Notional amount         $ 300,000