Credit Facility (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 30, 2020	Aug. 05, 2014 USD ($)
Line of Credit Facility [Line Items]
Proceeds from lines of credit	$ 1,400,000
Deferred financing costs, current	920,000	$ 575,000
Deferred financing costs, noncurrent	1,062,000	1,534,000
Regions Bank
Line of Credit Facility [Line Items]
Credit agreement, amount outstanding	255,500,000
Revolving Credit Facility | Regions Bank
Line of Credit Facility [Line Items]
Credit agreement, maximum borrowing capacity				$ 450,000,000
Secured Term Loan | Regions Bank
Line of Credit Facility [Line Items]
Leverage ratio			5.0
Net leverage ratio			3.50
Secured Syndicated Credit Facility, Eighth Amendment | Revolving Credit Facility | Regions Bank
Line of Credit Facility [Line Items]
Credit agreement, average amount outstanding during period		437,200,000
Credit agreement, maximum amount outstanding during period		438,000,000.0
Secured Syndicated Credit Facility, Eighth Amendment | Secured Term Loan | Regions Bank
Line of Credit Facility [Line Items]
Loans payable		276,200,000
Loans payable, current		20,700,000
Secured Syndicated Credit Facility | Revolving Credit Facility | Citi Bank
Line of Credit Facility [Line Items]
Credit agreement, amount outstanding	$ 439,400,000	$ 438,000,000.0
Line of credit, interest rate at period end	3.50%
Credit agreement, average amount outstanding during period	$ 438,900,000
Credit agreement, maximum amount outstanding during period	$ 439,400,000
Weighted average interest rate	4.04%	4.25%
Secured Syndicated Credit Facility, Second Amendment | Secured Term Loan | Regions Bank
Line of Credit Facility [Line Items]
Loans payable	$ 255,500,000
Secured Syndicated Credit Facility, Ninth Amendment | Regions Bank
Line of Credit Facility [Line Items]
Credit card origination costs	4,900,000	$ 5,200,000
Secured Syndicated Credit Facility, Ninth Amendment | Revolving Credit Facility | Regions Bank
Line of Credit Facility [Line Items]
Credit card origination costs	2,900,000	3,100,000
Secured Syndicated Credit Facility, Ninth Amendment | Secured Term Loan | Regions Bank
Line of Credit Facility [Line Items]
Loans payable, current	22,600,000
Periodic payment	20,700,000
Long-term debt, gross	232,900,000
Credit card origination costs	2,000,000.0	2,100,000
Deferred financing costs, current	919,000	575,000
Deferred financing costs, noncurrent	$ 1,000,000	$ 1,500,000