Income Taxes Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax benefit more likely than not percentage threshold	50.00%
Unrecognized tax benefits that would impact effective tax rate	$ 28,000	$ 47,500
Income tax penalties and interest expense		1,200
Accrual for interest and penalties	0	2,700
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits at January 1	56,150	57,473	$ 88,429
Gross increases - tax positions in prior period	539	0	0
Gross decreases - tax positions in prior period	0	0	(22,973)
Gross increases - tax positions in current period	0	338	0
Gross decreases - tax positions in current period	(1,489)	(1,661)	(7,983)
Lapse of statute of limitations	(20,115)	0	0
Unrecognized Tax Benefits at December 31	$ 35,085	$ 56,150	$ 57,473