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Stockholders' Equity Stockholders' Equity (Summary of Options) (Details) - $ / shares
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Period Adjustment     18,000  
Share-Based Compensation Arrangment By Share-Based Payment Award, Options Outstanding, Weighted Average Exercise Price, Adjustment     $ 18.94  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding at beginning of period (in shares)   1,695,000 1,381,000 766,000
Granted (in shares)   236,000 653,000 804,000
Exercised (in shares)   (112,000) (110,000) (68,000)
Canceled or expired (in shares) (146,100) (187,000) (229,000) (121,000)
Outstanding at end of year (in shares)   1,650,000 1,695,000 1,381,000
Exercisable at end of year (in shares)   1,106,000 583,000 329,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Outstanding at beginning of period   $ 18.95 $ 17.07 $ 13.03
Granted   20.06 22.66 20.20
Exercised   13.76 14.36 5.47
Canceled or expired   21.30 20.39 18.80
Outstanding at end of year   19.18 18.95 17.07
Exercisable at end of year   $ 18.21 $ 15.00 $ 10.97
Amended And Restated 2006 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,126,000    
Common Stock, Capital Shares Reserved for Future Issuance   5,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding at end of year (in shares)   1,650,000