Income Taxes (Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal
Current	$ 21,942	$ 44,469	$ 30,266
Deferred	(25,594)	20,444	(14,970)
Total	(3,652)	64,913	15,296
State
Current	943	4,421	5,234
Deferred	(1,203)	142	(577)
Total	(260)	4,563	4,657
Total, Current	22,885	48,890	35,500
Total, Deferred	(26,797)	20,586	(15,547)
Income tax (benefit) expense	$ (3,912)	$ 69,476	$ 19,953