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Stock-Based Compensation (Summary of Stock-Based Compensation Activity) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Stock Options [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Options, Outstanding at Beginning 1,578,389
Number of Options, Granted 279,000
Number of Options, Exercised (116,790)
Number of Options, Forfeited or expired (11,600)
Number of Options, Outstanding at Ending 1,728,999
Number of Options, Exercisable, Ending Balance 1,296,030
Number of Options, Vested or expected to vest, Ending Balance 1,728,999
Weighted-Average Exercise Price, Outstanding at Beginning | $ / shares $ 11.32
Weighted-Average Exercise Price, Granted | $ / shares 17.89
Weighted-Average Exercise Price, Exercised | $ / shares 9.00
Weighted-Average Exercise Price, Forfeited or expired | $ / shares 18.27
Weighted-Average Exercise Price, Outstanding at Ending | $ / shares 12.49
Weighted-Average Exercise Price, Exercisable, Ending Balance | $ / shares 14.57
Weighted-Average Exercise Price, Vested or expected to vest, Ending Balance | $ / shares $ 12.49
Weighted-Average Remaining Contractual Term, Outstanding, Ending Balance 5 years 4 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable, Ending Balance 4 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest, Ending Balance 5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ $ 5,960
Aggregate Intrinsic Value, Exercisable, Ending Balance | $ 5,923
Aggregate Intrinsic Value, Vested or expected to vest, Ending Balance | $ $ 5,960
Performance Share Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Units, Outstanding at Beginning 526,300
Number of Units, Granted 344,224
Number of Units, Earned (406,300)
Number of Units, Forfeited or expired (12,224)
Number of Units, Outstanding at Ending 452,000
Number of Units, Vested or expected to vest, Ending Balance 452,000
Weighted-Average Remaining Contractual Term, Outstanding, Ending Balance 1 year
Weighted- Average Remaining Contractual Term, Vested or expected to vest, Ending Balance 1 year