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Stock Based Compensation Stock Based Compensation (Summary of stock option awards) (Details) - Stock options [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options, Number of options outstanding (in shares):      
Outstanding, beginning balance (in shares) 705 1,024 1,228
Granted (in shares) 0 0 3
Exercised (in shares) (96) (260) (175)
Forfeited (in shares) (6) (14) (10)
Expired (in shares) (7) (45) (22)
Outstanding, ending balance (in shares) 596 705 1,024
Exercisable at December 31, 2017 (in shares) 596    
Vested and expected to vest at December 31, 2017 596    
Stock Options, Weighted average exercise price (in dollars per share):      
Outstanding, beginning balance (in dollars per share) $ 15.59 $ 15.15 $ 14.17
Granted (in dollars per share) 0.00 0.00 17.04
Exercised (in dollars per share) 14.01 13.05 7.90
Forfeited (in dollars per share) 17.04 17.04 17.04
Expired (in dollars per share) 16.37 19.89 17.53
Outstanding, ending balance (in dollars per share) 15.82 $ 15.59 $ 15.15
Exercisable at December 31, 2017 (in dollars per share) 15.82    
Vested and expected to vest at December 31, 2017 $ 15.82    
Stock Options, Contractual Term (in years)      
Outstanding at December 31, 2017 5 years 3 months 12 days    
Exercisable at December 31, 2017 5 years 3 months 12 days    
Vested and expected to vest at December 31, 2017 5 years 3 months 12 days    
Stock Options, Intrinsic Value      
Outstanding at December 31, 2017 $ 982    
Exercisable at December 31, 2107 982    
Vested and expected to vest at December 31, 2017 $ 982