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Earnings Per Share (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Income from continuing operations $ 29,200 $ 60,000 $ 24,800 $ 23,600 $ 94,400 $ 56,600 $ 64,400 $ 7,600 $ 137,591 $ 222,960 $ 154,135
Income (loss) from discontinued operations, net of income taxes                 38,749 20,903 80,898
Net Income $ 66,700 $ 60,500 $ 26,200 $ 22,900 $ 98,400 $ 62,700 $ 73,200 $ 9,600 $ 176,340 $ 243,863 $ 235,033
Earnings per share - basic:                      
Income (loss) from continuing operations (in dollars per share) $ 0.70 $ 1.41 $ 0.56 $ 0.52 $ 2.06 $ 1.24 $ 1.39 $ 0.16 $ 3.17 $ 4.84 $ 3.30
Income (loss) from discontinued operations (in dollars per share)                 0.89 0.45 1.73
Net income - basic (in dollars per share) 1.60 1.42 0.59 0.50 2.15 1.35 1.58 0.21 $ 4.06 $ 5.29 $ 5.03
Weighted-average shares outstanding (in thousands):                      
Weighted average common shares outstanding (in shares)                 43,434 46,104 46,743
Dilutive options (in shares)                 360 313 115
Weighted average common shares outstanding - assuming dilution (in shares)                 43,794 46,417 46,858
Earnings per share - diluted:                      
Income from continuing operations (in dollars per share) 0.69 1.40 0.56 0.51 2.04 1.23 1.38 0.16 $ 3.14 $ 4.81 $ 3.29
Income (loss) from discontinued operations (in dollars per share)                 0.88 0.45 1.73
Net income - diluted (in dollars per share) $ 1.58 $ 1.41 $ 0.59 $ 0.50 $ 2.13 $ 1.35 $ 1.57 $ 0.21 $ 4.02 $ 5.26 $ 5.02