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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amounts owed to employees participating in the Deferred Compensation Plan $ 3,400 $ 3,900
Obligations    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 3,000 4,000
New level 3 liability 0 0
Total (gains) losses reported in earnings 0 (1,000)
Transfers into or out of Level 3 0 0
Balance at end of period $ 3,000 $ 3,000