Income Taxes Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits		$ 12,702	$ 4,265
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 666
Unrecognized Tax Benefits	9,103	4,265
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	305	53
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	8,437
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	4,265	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 252	$ 53