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Stock-Based Compensation Summary of stock option activity (Details) - Time Based [Member] - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 375 375 454 474
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 17.95 $ 17.95 $ 17.63 $ 17.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0.00 $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (79) (94)    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 16.10 $ 15.51    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 0 (5)    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 0.00 $ 18.19