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Stock-Based Compensation (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of units deliverable (in shares) | shares 2,600,000    
Share conversion ratio 0.7189    
Immediate expense stock-based compensation     $ 1,436
Stock-based compensation expense $ 11,351 $ 8,392 16,212
Tax benefit related to converted shares 2,856 1,911 1,439
Unrecognized compensation cost $ 8,800    
Weighted average recognition period (in years) 1 year 6 months 21 days    
Additional income tax expense     384
Shares/Units Withheld for Taxes $ 4,963 3,424 $ 2,156
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of units vested 4,407 3,734  
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of units vested $ 6,323 $ 4,910