Income Taxes Uncertain Tax Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Income tax penalties and interest expense	$ 700,000	$ 0
Accrual for interest and penalties	$ 700,000	0
Unrecognized tax benefit more likely than not percentage threshold	50.00%
Unrecognized tax benefits that would impact effective tax rate	$ 66,500,000	65,200,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits at January 1	92,387,000	95,929,000	$ 113,466,000
Gross increases - tax positions in prior period	0	44,000	0
Gross decreases - tax positions in prior period	0	(2,903,000)	0
Gross increases - tax positions in current period	0	494,000	909,000
Gross decreases - tax positions in current period	(3,958,000)	(1,177,000)	(5,597,000)
Lapse of statute of limitations	0	0	(12,849,000)
Unrecognized Tax Benefits at December 31	$ 88,429,000	$ 92,387,000	$ 95,929,000