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Debt - $500 Million Term Loan B (Details) - USD ($)
12 Months Ended
May 11, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2019
Debt Instrument [Line Items]          
Write-off of deferred financing costs   $ 281,000 $ 3,079,000 $ 1,956,000  
Secured Debt [Member] | $500 Million Term Loan B [Member]          
Debt Instrument [Line Items]          
Face amount   $ 500,000,000      
Debt instrument, maturity date   May 11, 2024      
Percentage of amortization of original principal balance (as a percent)   1.00%      
Secured Debt [Member] | $500 Million Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Spread rate (as a percent) 2.00% 2.00%      
Notional amount         $ 350,000,000.0
Secured Debt [Member] | $500 Million Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Interest rate swaps | Derivatives designated as hedging instruments          
Debt Instrument [Line Items]          
Interest rate (as a percent)         1.2235%
Secured Debt [Member] | $500 Million Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Interest rate swaps | Derivatives designated as hedging instruments          
Debt Instrument [Line Items]          
Interest rate (as a percent)         1.2315%