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Notes Payable and Credit Agreement - Debt Balances (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 26, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 20, 2020	Aug. 13, 2020	Feb. 14, 2020	Oct. 01, 2019	Oct. 31, 2016
Debt Instrument [Line Items]
Total debt outstanding		$ 871,875	$ 625,000
Less unamortized fees and premium		(9,226)	(7,841)
Less current portion of notes payable		(4,688)	0
Long-term portion of notes payable		857,961	617,159
Proceeds from line of credit		245,000	101,000	$ 195,000
Senior Notes \| 2024 Notes
Debt Instrument [Line Items]
Total debt outstanding		$ 0	325,000
Interest rate		5.125%							5.125%
Senior Notes \| 2027 Notes
Debt Instrument [Line Items]
Total debt outstanding		$ 500,000	300,000
Interest rate						4.625%		4.625%
Senior Notes \| 2029 Notes
Debt Instrument [Line Items]
Total debt outstanding		$ 350,000	0
Interest rate		4.00%			4.00%
Secured Debt \| Term Loan Credit Facility
Debt Instrument [Line Items]
Total debt outstanding		$ 21,875	$ 0
Long-term portion of notes payable							$ 250,000
Senior Credit Facility \| Line of Credit \| Subsequent Event
Debt Instrument [Line Items]
Proceeds from line of credit	$ 25,000