Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 45,989				$ 44,841				$ 45,989	$ 44,841	$ 95,831	$ 85,762
Unrecognized Tax Benefits, Additions Based on Tax Positions Related to Current Year									0	0	7,384
Unrecognized Tax Benefits, Additions for Tax Positions of Prior Years									1,148	2,268	2,685
Unrecognized Tax Benefits, Reductions for Tax Positions of Prior Years									0	(53,258)	0
Unrecognized Tax Benefits, Interest on Income Taxes Expense									9,900	8,800	6,500
Income Tax Expense (Benefit)	$ (23)	$ 86	$ 1,242	$ 5,810	$ (596)	$ 12,671	$ (1,553)	$ 2,542	7,115	13,064	35,141
Interest on Prior Year Income Tax Expense [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income Tax Expense (Benefit)									$ 1,100	$ 2,300	$ 800