Income Taxes Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,658	$ 2,300	$ 3,534	$ 858
Effective Income Tax Rate Reconciliation, Percent	20.90%	30.30%	20.50%	19.00%