Earnings Per Share (Schedule Of Reconciliation Of The Amounts Used To Calculate Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share
(Loss) income from continuing operations	$ 9,180	$ 18,035	$ (99,664)	$ 44,461
Provision for income taxes from discontinued operations	127	(360)	253	(232)
(Loss) income from discontinued operations	(127)	360	(253)	232
Net income (loss)	$ 9,053	$ 18,395	$ (99,917)	$ 44,693
Weighted average number of common shares outstanding	35,983	34,112	35,742	34,021
(Loss) income from continuing operations	$ 0.26	$ 0.53	$ (2.79)	$ 1.31
Loss from discontinued operations	$ (0.01)	$ 0.01	$ (0.01)	$ 0.01
Net income (loss)	$ 0.25	$ 0.54	$ (2.80)	$ 1.32
Effect of dilutive securities	725	1,363		1,252
Weighted average number of common and common equivalent shares outstanding	36,708	35,475	35,742	35,273
(Loss) income from continuing operations	$ 0.25	$ 0.51	$ (2.79)	$ 1.26
Loss from discontinued operations	$ 0.00	$ 0.01	$ (0.01)	$ 0.01
Net income (loss)	$ 0.25	$ 0.52	$ (2.80)	$ 1.27

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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