Income Taxes Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	$ 9,300
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0	$ 0
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(78)	(4)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(2)	(60)
Liability for Uncertain Tax Positions, Noncurrent	17,402	8,146	$ 6,948
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	$ 9,336	$ 1,262