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Supplemental Information - Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 426,841		$ 374,892
Goodwill	671,542		668,211
Assets	1,587,178		1,511,312
Accruals and other liabilities	250,070		274,968
Liabilities	1,970,231		1,893,085
Accumulated deficit	(698,635)		(709,751)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(407,692)	$ (405,583)	(408,910)	$ (184,606)	$ (183,944)	$ (190,575)
Liabilities and Equity	$ 1,587,178		$ 1,511,312

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