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Retirement Agreements and Other Postretirement Benefit Plan (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
h
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
DefinedContributionPlanMinimumNumberOfMonthsEmployedEligibility 3 months    
Minimum number of years employed in order to participate in the 401(k) plan 1 year    
Minimum number of hours worked annually in order to participate in the 401(k) plan | h 1,000    
Defined contribution plan contribution percent 3.00%    
Expenses related to the 401(k) plan $ 1,200 $ 1,600 $ 810
Amount accrued for all deferred compensation plan agreements 10,900 9,500  
Amount recognized in accumulated other comprehensive income, before tax (41) (87) 166
Amount recognized in accumulated other comprehensive income, net of tax (32) $ (58) $ (110)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2019 12    
2020 14    
2021 16    
2022 23    
2023 32    
Next 5 years thereafter $ 192    
Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Noncompete period following employment 2 years