Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Leasing Equipment, Accumulated Depreciation and Allowances	$ 2,218,897	$ 1,787,505
Net Investment in Finance Leases, Allowances	0	527
Accounts Receivable, Allowances	3,002	28,082
Debt, Unamortized Deferred Financing Costs	40,636	19,999
Lease intangibles, Accumulated Amortization	144,081	55,484
Common Stock, Value, Issued	$ 807	$ 744
Common stock, shares issued (in shares)	80,687,757	74,376,025
Designated Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	294,000,000	294,000,000
Undesignated Common Stock [Member]
Common Stock, Value, Issued	$ 0	$ 0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	6,000,000	6,000,000