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Direct Financing Leases and Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Direct financing leases, net $ 333,152 $ 347,703
Investments held in Rabbi Trusts 48,451 41,720
Contract incentives 27,324 23,691
Insurance receivables 18,402 28,999
Debt issuance costs 2,593 3,365
Prepaid pension asset 14,049 44,124
Interest rate swap agreements 1,864 5,421
Other 26,449 15,223
Total 472,284 510,246
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 5,391 5,214
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 30,229 24,824
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 5,232 4,713
Common collective trusts | Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in Rabbi Trusts $ 7,599 $ 6,969