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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accounting Policies [Abstract]
Net income (loss) from continuing operations	$ 82,997	$ 5,712	$ 92,832	$ 44,073
Basic weighted average common shares outstanding	45,257	40,386	45,277	40,083
Effect of dilutive instruments	772	541	832	518
Diluted weighted average common shares outstanding	46,029	40,927	46,109	40,601
Income From Continuing Operations Per Common Share
Net income from continuing operations - basic (in dollars per share)	$ 1.83	$ 0.14	$ 2.05	$ 1.10
Net income from continuing operations - diluted (in dollars per share)	$ 1.80	$ 0.14	$ 2.01	$ 1.09