Earnings Per Share (Earnings (Loss) 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
Income/(Loss) of Basic earnings per common share	$ 49,819	$ 32,175	$ 90,846	$ 68,328
Income/(Loss) of Effect of dilutive stock options, restricted stock and stock appreciation rights (SARs)	0	0	0	0
Income/(Loss) of Diluted earnings per common share	$ 49,819	$ 32,175	$ 90,846	$ 68,328
Weighted Shares of Basic earnings per common share	47,655	47,171	47,620	47,146
Weighted Shares of Effect of dilutive stock options, restricted stock and stock appreciation rights (SARs)	328	485	324	525
Weighted Shares of Diluted earnings per common share	47,983	47,656	47,944	47,671
Per-Share Amount of Basic earnings per common share	$ 1.05	$ 0.68	$ 1.91	$ 1.45
Per-Share Amount of Effect of dilutive stock options, restricted stock and stock appreciation rights (SARs)	$ (0.01)	$ 0.00	$ (0.02)	$ (0.02)
Per-Share Amount of Diluted earnings per common share	$ 1.04	$ 0.68	$ 1.89	$ 1.43

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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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