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Stock-Based Compensation and Employee Benefits (Details 4) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted- Average Grant- Date Fair Value      
Compensation expense $ 11,733,000    
Unrecognized compensation expense 25,305,000    
Share-Based Payment Arrangement, Nonemployee      
Weighted- Average Grant- Date Fair Value      
Compensation expense $ 36,000 $ 62,000 $ 61,000
RSUs      
Number of Shares      
RSUs outstanding at beginning of year 349,533 423,732 425,055
Granted 386,913 95,891 121,243
RSUs exercised (140,666) (121,507) (102,057)
SARs forfeited (37,468) (48,583) (20,509)
RSUs outstanding at year-end 558,312 349,533 423,732
Weighted- Average Grant- Date Fair Value      
Balance at beginning of year, weighted average grant-date fair value $ 69.11 $ 60.01 $ 51.28
Granted, weighted average grant-date fair value 59.28 88.07 80.40
RSUs exercised 59.97 54.97 48.93
Forfeited, weighted average grant-date fair value 62.73 63.60 54.75
Balance at year end, weighted average grant-date fair value $ 64.95 $ 69.11 $ 60.01
Compensation expense   $ 8,803,000 $ 7,790,000
Unrecognized compensation expense   $ 16,538,000 $ 18,730,000
Weighted average period over which unrecognized compensation expense is expected to be recognized (in years) 3 years 1 month 2 days 2 years 10 months 24 days 3 years 1 month 24 days