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Summary of Significant Accounting Policies Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]                      
Income from continuing operations for calculating basic and diluted earnings per share                 $ 60,127 $ 60,710 $ 85,438
Loss from discontinued operations                 0 0 (272)
Net income $ 36,692 $ (1,412) $ 11,673 $ 13,174 $ 19,410 $ 11,173 $ 13,339 $ 16,788 $ 60,127 $ 60,710 $ 85,166
Weighted-average common shares for calculating basic earnings per share                 34,997 28,138 28,671
Stock options and nonvested awards                 7 188 399
Weighted-average common shares for calculating diluted earnings per share 48,532 34,631 28,243 28,241 28,097 28,224 28,411 28,620 35,004 28,326 29,070
Income from continuing operations (basic) (in dollars per share)                 $ 1.72 $ 2.16 $ 2.98
Loss from discontinued operations (basic) (in dollars per share)                 0.00 0.00 (0.01)
Net income per basic share (in dollars per share)                 1.72 2.16 2.97
Income from continuing operations (diluted) (in dollars per share)                 1.72 2.14 2.94
Loss from discontinued operations (diluted) (in dollars per share)                 0.00 0.00 (0.01)
Net income per diluted share (in dollars per share) $ 0.76 $ (0.04) $ 0.41 $ 0.47 $ 0.69 $ 0.40 $ 0.47 $ 0.59 $ 1.72 $ 2.14 $ 2.93