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Summary of Significant Accounting Policies - Additional Disclosures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) activity segment	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of business activities | activity	1
Number of operating segments | segment	1
Adjustment to retained earnings	$ (650,471)	$ (637,788)	$ (488,117)	$ (485,613)
Accounts receivable, net	126,415	114,608
Allowance for credit losses	2,137	2,198
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings				1,198
Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings	$ (52,458)	$ (40,622)	$ (57,749)	(57,522)
Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings				$ 1,198

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