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Stockholders' Equity Stockholders' Equity (Summary of Options) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at beginning of period (in shares) 1,381 766  
Granted (in shares) 653 804 563
Exercised (in shares) (110) (68) (45)
Canceled or expired (in shares) (229) (121) (64)
Outstanding at end of year (in shares) 1,695 1,381 766
Exercisable at end of year (in shares) 583 329 192
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding at beginning of period $ 17.07 $ 13.03 $ 5.41
Granted 22.66 20.20 16.73
Exercised 14.36 5.47 5.33
Canceled or expired 20.39 18.80 13.82
Outstanding at end of year 18.95 17.07 13.03
Exercisable at end of year $ 15.00 $ 10.97 $ 5.36