Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current expense (benefit):
Federal	$ (569)	$ 999	$ 158
State	2,993	1,733	2,076
Total current expense	2,424	2,732	2,234
Deferred expense (benefit):
Federal	15,023	36,569	13,146
State	(311)	(270)	1
Total deferred expense	14,712	36,299	13,147
Total income tax expense	$ 17,136	$ 39,031	$ 15,381