Summary Of Significant Accounting Policies (Schedule Of Supplemental Net Income Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Net income (loss) from continuing operations	$ 5,712	$ (1,945)	$ 44,073	$ 34,414
Basic weighted average common shares outstanding	40,386	39,634	40,083	39,559
Effect of dilutive instruments	541	0	518	433
Diluted weighted average common shares outstanding	40,927	39,634	40,601	39,992
Net income (loss) from continuing operations per common share
Net income from continuing operations - basic (in dollars per share)	$ 0.14	$ (0.05)	$ 1.10	$ 0.87
Net income from continuing operations - diluted (in dollars per share)	$ 0.14	$ (0.05)	$ 1.09	$ 0.86