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Equity-Based Compensation Plans (Schedule of Company's Stock Options Outstanding) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of shares:      
Balance options outstanding, beginning 38,689 59,948 117,408
Granted
Exercised (29,689) (21,259) (23,710)
Forfeited
Expired (33,750)
Balance options outstanding, end 9,000 38,689 59,948
Exercisable, end of period 9,000    
Weighted-Average Exercise Price      
Balance, beginning $ 16.09 $ 17.18 $ 18.12
Granted
Exercised 16.61 19.16 15.84
Forfeited
Expired 21.39
Outstanding 14.53 $ 16.09 $ 17.18
Exercisable $ 14.53    
Weighted- Average Contractual Term (years), outstanding 5 months 1 day    
Weighted- Average Contractual Term (years), exercisable 5 months 1 day    
Aggregate Intrinsic Value, exercised $ 659,743 $ 236,584 $ 81,894
Aggregate Intrinsic Value, outstanding 163,038    
Aggregate Intrinsic Value, exercisable $ 163,038