Income Taxes Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Federal statutory rate		35.00%	35.00%	35.00%
Other income tax benefit		$ 17,000
Tax benefit related to prior years	$ 4,300	12,500
Recognition of unrecognized tax benefit		$ 0	$ 0	$ 12,607
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Earliest year subject to examination		2000