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Earnings Per Share (Summary Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]          
Net income (loss) attributable to common stockholders - basic and diluted $ 30,426   $ 18,086 $ 42,949 $ 25,241
Less: Net income allocable to Series A convertible preferred stockholders (5,121)   (2,843) (7,205) (3,971)
Adjusted net income available to common stockholders - basic and diluted $ 25,305   $ 15,243 $ 35,744 $ 21,270
Weighted average common shares outstanding - basic (shares) 68,153   73,953 68,427 73,882
Plus: dilutive effect of stock options and unvested restricted stock units (shares) 3,314   619 2,035 743
Weighted average common shares outstanding - diluted (shares) 71,467   74,572 70,462 74,625
Basic (in dollars per share) $ 0.37 $ 0.52 $ 0.21 $ 0.52 $ 0.29
Diluted (in dollars per share) $ 0.35 $ 0.51 $ 0.20 $ 0.51 $ 0.29