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Direct Financing Leases and Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Non-current portion $ 375,707 $ 364,847
Investments held in rabbi trusts 59,403 61,425
Contract incentives 24,820 14,857
Insurance receivables 17,547 15,545
Start-up costs 13,156 13,750
Prepaid pension asset 51,133 58,708
Lease origination costs 9,769 9,387
Deferred tax asset 14,153 6,736
Noncurrent income tax receivable 11,067 0
Other 29,874 25,451
Total 606,629 570,706
Cash and cash equivalents | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in rabbi trusts 15,578 4,956
U.S. equity mutual funds | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in rabbi trusts 29,298 39,958
Foreign equity mutual funds | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in rabbi trusts 6,678 8,001
Fixed income mutual funds | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in rabbi trusts $ 7,849 $ 8,510