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Share-Based Payment Arrangements (Summary of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate Intrinsic Value, Cancelled/Forfeited  
Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding at Beginning 88,301  
Number of Shares, Exercised/Released (32,458)  
Number of Shares, Cancelled/Forfeited  
Number of Shares, Expired (2,298)  
Number of Shares, Outstanding at Ending 53,545 88,301
Number of Shares, Exercisable at Ending 53,545  
Weighted Average Exercise Price, Outstanding at Beginning $ 34.84  
Weighted Average Exercise Price, Exercised/Released 37.02  
Weighted Average Exercise Price, Cancelled/Forfeited  
Weighted Average Exercise Price, Expired 44.91  
Weighted Average Exercise Price, Outstanding at Ending 33.09 $ 34.84
Weighted Average Exercise Price, Exercisable at Ending $ 33.09  
Weighted Average Remaining Contractual Term (Years) 2 years 9 months 18 days 2 years 9 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending 2 years 9 months 18 days  
Aggregate Intrinsic Value, Outstanding at Beginning $ 1,294  
Aggregate Intrinsic Value, Exercised/Released 564  
Aggregate Intrinsic Value, Expired 10  
Aggregate Intrinsic Value, Outstanding at Ending 726 $ 1,294
Aggregate Intrinsic Value, Exercisable at Ending $ 726