Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 01, 2019
Tax effects of temporary differences
Decrease in foreign taxes due to tax holidays	$ 100	$ 300	$ 700
Effect on diluted per share due to decrease in foreign tax holiday (in dollars per share)	$ 0.01	$ 0.02	$ 0.04
Undistributed earnings	$ 13,800
Deferred tax liability that would be recognized if earnings were distributed	500
Net operating loss carryforwards	353,358	$ 338,403
Operating loss carryforwards	$ 1,415,900	$ 1,355,400
Statutory tax rate	24.94%	24.94%	26.01%
Operating loss carryback, CARES Act	$ 14,800
Unrecognized tax benefits that would affect the effective tax rate	13,200	$ 13,500
Unrecognized tax benefits, income tax penalties and interest accrued	4,600	3,700
Domestic - Luxembourg
Tax effects of temporary differences
Operating loss carryforwards, valuation allowance	349,800	337,700
Change in statutory income tax rate		14,000
Foreign - U.S. state
Tax effects of temporary differences
Income recognized on deferred foreign income	465	(341)	$ 134
Operating loss carryforwards, valuation allowance	800	500
Deferred tax asset relating to tax credits	900	600
Foreign - U.S. federal
Tax effects of temporary differences
Income recognized on deferred foreign income	2,808	(329)	(291)
Operating loss carryforwards, valuation allowance	2,400	100
Foreign - non-U.S.
Tax effects of temporary differences
Income recognized on deferred foreign income	1,984	(648)	$ (707)
Change in statutory income tax rate	1,400
Philippines
Tax effects of temporary differences
Income recognized on deferred foreign income		$ 900
India
Tax effects of temporary differences
Income recognized on deferred foreign income	$ 68,000
Financial Services Business | Discontinued Operations, Disposed of by Sale
Tax effects of temporary differences
Capital loss, deferred tax asset				$ 10,400