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Deferred Compensation Plan Deferred Compensation Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Plan [Abstract]      
Maximum Deferral Percentage of Base Compensation under Deferred Compensation Plan 50.00%    
Maximum Deferral Percentage of Bonus Compensation under Deferred Compensation Plan 100.00%    
Contributions by Employer under Deferred Compensation Plan $ 50 $ 100 $ 300
Employer match under Deferred Compensation Plan, Percent 50.00%    
Employee Contribution Maximum Percent of Compensation under Deferred Compensation Plan 6.00%    
Discretionary Contribution under Deferred Compensation Plan $ 0    
Deferred compensation $ 8,687 $ 11,323