Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital Leases, Net Investment in Direct Financing and Sales Type Leases	$ 295,891	$ 346,810
Asset Impairment (Charges) Reversal, Net	(19,400)
Debt, Unamortized Deferred Financing Costs	40,636	19,999
Adjustment to Purchase Price of Debt	27,516	42,216
Fair value of derivative instruments	7,376	5,743
Fair value of derivative instruments	2,503	9,404
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	(2,242)	(12,063)
Derivatives Not Designated as Hedging Instruments | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivative instruments	3,822	5,217
Fair value of derivative instruments	0	676
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivative instruments	3,554	526
Fair value of derivative instruments	2,503	8,728
Carrying value containers impaired to fair value [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	$ (6,104)	$ (41,067)