Supplemental Information - Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 359,306		$ 449,288			$ 394,085
Goodwill	706,946		731,691			732,752
Deferred tax assets	82,696		84,900			91,436
Assets	1,705,452		1,828,306			1,600,950
Accruals and other liabilities	264,572		353,575
Liabilities	1,853,345		1,981,908
Accumulated deficit	(480,368)		(480,779)			(475,526)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(184,603)	$ (183,943)	(190,575)	$ (182,600)	$ (184,896)	(257,590)
Liabilities and Equity	$ 1,705,452		1,828,306			1,600,950
Previously Reported
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accounts Receivable, after Allowance for Credit Loss, Current			450,403			395,200
Goodwill			740,674			740,955
Deferred tax assets			85,988			92,741
Assets			1,839,492			1,611,573
Accumulated deficit			(469,593)			(464,903)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(179,389)			(246,967)
Liabilities and Equity			1,839,492			1,611,573
Restatement Adjustment
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accounts Receivable, after Allowance for Credit Loss, Current			(1,115)			(1,115)
Goodwill			(8,983)			(8,203)
Deferred tax assets			(1,088)			(1,305)
Assets			(11,186)			(10,623)
Accumulated deficit			(11,186)			(10,623)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(11,186)			(10,623)
Liabilities and Equity			$ (11,186)			$ (10,623)