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								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Net income from continuing operations	$ (22,215)	$ 5,712	$ 35,837	$ 2,524	$ 16,763	$ (1,945)	$ 25,683	$ 10,676	$ 21,858	$ 51,177	$ 32,534
Basic weighted average common shares outstanding (in shares)									40,781	39,591	39,077
Effect of dilutive instruments (in shares)									574	435	591
Diluted weighted average common shares outstanding (in shares)									41,355	40,026	39,668
Net income from continuing operations per common share
Net income from continued operations (in dollars per share)	$ (0.52)	$ 0.14	$ 0.89	$ 0.06	$ 0.42	$ (0.05)	$ 0.65	$ 0.27	$ 0.54	$ 1.29	$ 0.83
Net income from continuing operations (in dollars per share)	$ (0.52)	$ 0.14	$ 0.88	$ 0.06	$ 0.42	$ (0.05)	$ 0.64	$ 0.27	$ 0.53	$ 1.28	$ 0.82