Income Taxes (Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal
Current	$ 17,444	$ 21,942	$ 44,469
Deferred	(21,947)	(25,594)	20,444
Total	(4,503)	(3,652)	64,913
State
Current	2,239	943	4,421
Deferred	(56)	(1,203)	142
Total	2,183	(260)	4,563
Total, Current	19,683	22,885	48,890
Total, Deferred	(22,003)	(26,797)	20,586
Income tax (benefit) expense	$ (2,320)	$ (3,912)	$ 69,476