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Share Based Compensation (Options Outstanding And Exercisable) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
2.54 to 6.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, Lower $ 2.54
Range of exercise price, Upper 6.00
6.01 to 10.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, Lower 6.01
Range of exercise price, Upper 10.00
10.01 to 17.50 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, Lower 10.01
Range of exercise price, Upper 17.50
17.51 to 20.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, Lower 17.51
Range of exercise price, Upper 20.00
20.01 to 25.93 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, Lower 20.01
Range of exercise price, Upper $ 25.93
Employee Stock Option and Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, number of awards | shares 303,472
Options Outstanding, WAEP $ 17.20
Options Outstanding, Aggregate Intrinsic Value | $ $ 1,812
Options Exercisable, number of awards | shares 82,483
Options Exercisable, WAEP $ 16.23
Options Exercisable, Aggregate Intrinsic Value | $ $ 541
Employee Stock Option and Stock Appreciation Rights (SARs) [Member] | 2.54 to 6.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, number of awards | shares 5,000
Options Outstanding, WAEP $ 2.54
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs) 6 years 3 months 29 days
Options Outstanding, Aggregate Intrinsic Value | $ $ 95
Options Exercisable, number of awards | shares 5,000
Options Exercisable, WAEP $ 2.54
Options Exercisable, Aggregate Intrinsic Value | $ $ 95
Employee Stock Option and Stock Appreciation Rights (SARs) [Member] | 6.01 to 10.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, number of awards | shares 5,640
Options Outstanding, WAEP $ 8.91
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs) 1 year 9 months 15 days
Options Outstanding, Aggregate Intrinsic Value | $ $ 71
Options Exercisable, number of awards | shares 5,640
Options Exercisable, WAEP $ 8.91
Options Exercisable, Aggregate Intrinsic Value | $ $ 71
Employee Stock Option and Stock Appreciation Rights (SARs) [Member] | 10.01 to 17.50 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, number of awards | shares 166,717
Options Outstanding, WAEP $ 12.01
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs) 8 years 26 days
Options Outstanding, Aggregate Intrinsic Value | $ $ 1,589
Options Exercisable, number of awards | shares 33,343
Options Exercisable, WAEP $ 12.01
Options Exercisable, Aggregate Intrinsic Value | $ $ 318
Employee Stock Option and Stock Appreciation Rights (SARs) [Member] | 17.51 to 20.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, number of awards | shares 15,100
Options Outstanding, WAEP $ 17.81
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs) 1 year 3 months 11 days
Options Outstanding, Aggregate Intrinsic Value | $ $ 57
Options Exercisable, number of awards | shares 15,100
Options Exercisable, WAEP $ 17.81
Options Exercisable, Aggregate Intrinsic Value | $ $ 57
Employee Stock Option and Stock Appreciation Rights (SARs) [Member] | 20.01 to 25.93 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, number of awards | shares 111,015
Options Outstanding, WAEP $ 25.99
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs) 8 years 1 month 21 days
Options Outstanding, Aggregate Intrinsic Value | $ $ 0
Options Exercisable, number of awards | shares 23,400
Options Exercisable, WAEP $ 25.93
Options Exercisable, Aggregate Intrinsic Value | $ $ 0