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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]                      
Net income $ 67,734 $ 28,274 $ 15,239 $ 32,645 $ 36,692 $ (1,412) $ 11,673 $ 13,174 $ 143,892 $ 60,127 $ 60,710
Weighted-average common shares for calculating basic earnings per share                 47,854 34,997 28,138
Stock options and nonvested stock awards                 34 7 188
Weighted-average common shares for calculating diluted earnings per share 47,212 47,668 48,289 48,402 48,532 34,631 28,243 28,241 47,888 35,004 28,326
Income from continuing operations (basic) (in dollars per share)                 $ 3.01 $ 1.72 $ 2.16
Loss from discontinued operations (basic) (in dollars per share)                 $ 3.00 $ 1.72 $ 2.14
Net income per diluted share (in dollars per share) $ 1.43 $ 0.59 $ 0.32 $ 0.67 $ 0.76 $ (0.04) $ 0.41 $ 0.47