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Long-term Debt - Credit Agreement (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jan. 08, 2021	Dec. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2016
Debt Instrument [Line Items]
Loss on repayment of debt, net			$ 0	$ 0	$ (19,158,000)	$ 0
Initial Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Face amount		$ 75,000,000.0
Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Loss on repayment of debt, net	$ 19,200,000
Unamortized debt issuance cost	9,500,000
Legal expenses	35,000
Credit Agreement | Line of Credit | DDTL Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 50,000,000.0
Commitment fee percentage		1.00%
2021 Notes | Senior Notes
Debt Instrument [Line Items]
Face amount			$ 26,737,000		$ 26,737,000		$ 26,737,000	$ 125,000,000.0
Interest rate		2.00%						2.00%
Debt issuance costs								$ 4,600,000
Senior Credit Facilities | Secured Debt
Debt Instrument [Line Items]
Debt issuance costs		$ 4,700,000
Non-cash amortization of debt discount and debt issuance costs				$ 500,000		$ 1,100,000
Repayments of long-term lines of credit	98,600,000
Payments of make-whole premium	9,700,000
Accrued interest	$ 200,000
Senior Credit Facilities | Secured Debt | After the Second Anniversary of the Closing of the Senior Credit Facilities but Prior to the Third Anniversary
Debt Instrument [Line Items]
Redemption, call protection premium, percentage		4.00%
Senior Credit Facilities | Secured Debt | After the Third Anniversary of the Closing of the Senior Credit Facilities but Prior to the Fourth Anniversary
Debt Instrument [Line Items]
Redemption, call protection premium, percentage		3.00%
Senior Credit Facilities | Secured Debt | After the Fourth Anniversary of the Closing of the Senior Credit Facilities but Prior to the Fifth Anniversary
Debt Instrument [Line Items]
Redemption, call protection premium, percentage		2.00%
Senior Credit Facilities | Secured Debt | Maximum
Debt Instrument [Line Items]
Term		91 days
Senior Credit Facilities | Secured Debt | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate		8.00%
Senior Credit Facilities | Secured Debt | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		7.00%

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