Income Tax Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax [Abstract]
Increase (Decrease) in Deferred Income Taxes	$ (1,427)	$ (454)
Income Tax Expense (Benefit)	$ 1,673	$ 648
Effective income tax rate	28.80%	34.40%