Income Taxes (Schedule of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current	$ 16,657	$ (6,178)	$ 128
Deferred	14,325	2,143	1,097
Net operating loss carryforwards	1,039	(290)	(6,793)
Income tax provision (benefit)	$ 32,021	$ (4,325)	$ (5,568)