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Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Feb. 04, 2019
Dec. 31, 2017
Liabilities:      
Accounts receivable, transferred to third party $ 6,900    
Proceeds from sale and collection of receivables 6,900    
Recurring      
Restricted investments:      
Rabbi Trust 20,892   $ 20,763
Fixed income securities 1,801   1,902
Recurring | Quoted Prices in Active Markets (Level 1)      
Restricted investments:      
Rabbi Trust 0   0
Fixed income securities 0   0
Recurring | Significant Other Observable Inputs (Level 2)      
Restricted investments:      
Rabbi Trust 20,892   20,763
Fixed income securities 1,801   1,902
Recurring | Significant Unobservable Inputs (Level 3)      
Restricted investments:      
Rabbi Trust 0   0
Fixed income securities 0   0
Interest Rate Swap | Recurring      
Liabilities:      
Interest rate swap derivative liability 8,638   13,992
Interest Rate Swap | Recurring | Quoted Prices in Active Markets (Level 1)      
Liabilities:      
Interest rate swap derivative liability 0   0
Interest Rate Swap | Recurring | Significant Other Observable Inputs (Level 2)      
Liabilities:      
Interest rate swap derivative liability 8,638   13,992
Interest Rate Swap | Recurring | Significant Unobservable Inputs (Level 3)      
Liabilities:      
Interest rate swap derivative liability $ 0   $ 0
Subsequent Event      
Liabilities:      
Accounts receivable, transferred to third party   $ 3,000