Annual report pursuant to Section 13 and 15(d)

Earnings (Loss) Per Share (Schedule Of Calculation Of Basic Earnings (Loss) Per Common Share) (Details)

v2.4.0.6
Earnings (Loss) Per Share (Schedule Of Calculation Of Basic Earnings (Loss) Per Common Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings (Loss) Per Share [Abstract]                      
Net income (loss) $ 46,065 $ 52,928 $ 55,175 $ 18,649 $ 20,519 $ 27,188 $ 27,870 $ 42,315 $ 172,817 $ 117,892 $ (187,919)
Less portion allocated to nonvested shares                 3,211 1,178  
Net income (loss) allocated to common shares                 $ 169,606 $ 116,714 $ (187,919)
Weighted average common shares outstanding 74,033       73,685       74,033 73,685 74,852
Basic and diluted earnings (loss) per common share $ 0.61 [1] $ 0.70 [1] $ 0.73 [1] $ 0.25 [1] $ 0.27 [1] $ 0.36 [1] $ 0.37 [1] $ 0.57 [1] $ 2.29 $ 1.58 $ (2.51)
Shares excluded due to being anti-dilutive                 1,873 1,540 1,347
[1] The sum of the individual quarterly earnings per share may not agree with year-to-date earnings per share because each quarterly calculation is based on the income for that quarter and the weighted average number of shares outstanding during that quarter.