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Stock-Based Compensation Plans and Employee Benefits (Stock-Based Compensation) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 17,563 $ 18,812 $ 10,889
Unrecognized compensation cost $ 2,000    
Weighted-average period to recognize the unrecognized compensation cost 1 year 11 months 23 days    
Long-term Incentive Plan 2009      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 8,000,000    
Shares available for issuance 2,600,000    
Common stock subject to sales restriction | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued 213,609    
Non-vested weighted average grant date fair value per share (in dollars per share) $ 10.10    
Non-vested, aggregate intrinsic value $ 2,200    
Restricted shares awarded 135,503    
Sale restriction period 18 months