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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Income from continuing operations $ 46,310 $ 24,820 $ 132,184 $ 48,337
Income (loss) from discontinued operations, net of taxes 0 1,371 0 786
Net Income (Loss) $ 46,310 $ 26,191 $ 132,184 $ 49,123
Weighted average common shares outstanding (in shares) 39,360 44,078 40,134 44,851
Earnings per share - basic:        
Income from continuing operations (in dollars per share) $ 1.18 $ 0.56 $ 3.29 $ 1.07
Income (loss) from discontinued operations (in dollars per share) 0.00 0.03 0.00 0.02
Net Income - basic (in dollars per share) $ 1.18 $ 0.59 $ 3.29 $ 1.09
Weighted-average shares outstanding (in thousands):        
Weighted average common shares outstanding (in shares) 39,360 44,078 40,134 44,851
Common share equivalents: Dilutive options (in shares) 360 331 371 367
Weighted average common shares outstanding - assuming dilution (in shares) 39,720 44,409 40,505 45,218
Earnings per share - diluted:        
Income from continuing operations (in dollars per share) $ 1.17 $ 0.56 $ 3.26 $ 1.07
Income (loss) discontinued operations (in dollars per share) 0.00 0.03 0.00 0.02
Net Income - diluted (in dollars per share) $ 1.17 $ 0.59 $ 3.26 $ 1.09