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Stock-Based Compensation (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
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   $ 1,436,000  
Stock-based compensation expense $ 8,392,000 16,212,000 $ 10,986,000
Tax benefit related to converted shares 1,911,000 1,439,000 607,000
Unrecognized compensation cost $ 13,927,000    
Weighted average recognition period (in years) 2 years 27 days    
Additional income tax expense   384,000  
Shares/Units Withheld for Taxes $ 3,424,000 2,156,000 $ 0
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of units vested 3,734,000 534,000  
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of units vested $ 4,910,000 $ 0