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Retirement Agreements and Other Postretirement Benefit Plan (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
h
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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 $ 810,000 $ 741,000 $ 676,000
Amount accrued for all deferred compensation plan agreements 8,487,000 7,818,000  
Amount recognized in accumulated other comprehensive income, before tax (165,437) (173,812) (118,150)
Amount recognized in accumulated other comprehensive income, net of tax (109,200) $ (114,726) $ (77,988)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]      
2017 13,521    
2018 18,628    
2019 20,330    
2020 22,150    
2021 23,981    
Thereafter $ 216,988    
Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Noncompete period following employment 2 years