Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current tax expense	$ 2,980	$ 9,898	$ 8,711
Deferred tax (benefit)	8,997	(698)	(534)
Total income tax expense (benefit)	$ 11,977	$ 9,200	$ 8,177