Income Tax (Income Tax Provision (Benefit) On Income From Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Abstract]
Federal	$ 19,113	$ 17,239	$ 13,552
State	1,976	2,233	2,252
Current income tax expense benefit	21,089	19,472	15,804
Deferred	(215)	(2,916)	(959)
Income tax expense benefit	$ 20,874	$ 16,556	$ 14,845