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Direct Financing Leases and Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Direct financing leases, net $ 347,703 $ 331,065
Investments held in Rabbi Trusts 41,720 38,681
Contract incentives 23,691 21,475
Insurance receivables 28,999 13,957
Debt issuance costs 18,594 16,503
Prepaid pension asset 44,124 2,698
Interest rate swap agreements 5,421 4,565
Other 15,223 17,155
Total 525,475 446,099
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in Rabbi Trusts 5,214 4,418
U S Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in Rabbi Trusts 24,824 23,589
Foreign Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in Rabbi Trusts 4,713 4,724
Common collective trusts | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments held in Rabbi Trusts $ 6,969 $ 5,950