Income Taxes - Reconciliations Valuation Allowance on Deferred Tax Assets (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 778,262	$ 815,689	$ 1,167,927
(Deductions) additions to costs and expenses	11,611	335	7,175
Additions: charges to other accounts	0	0	0
Deductions	(248,232)	(37,762)	(359,413)
Balance at end of period	$ 541,641	$ 778,262	$ 815,689