Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Leasing equipment, accumulated depreciation and allowances	$ 3,135,646	$ 2,933,886
Accounts receivable, allowances	2,483	1,276
Finite-Lived Intangible Assets, Accumulated Amortization	254,207	242,301
Deferred financing costs	$ 34,088	$ 39,781
Class of Stock [Line Items]
Common Shares, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Shares, Shares Authorized (in shares)	270,000,000	270,000,000
Treasury Stock, Shares (in shares)	12,187,889	1,853,148
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Designated Common Stock
Class of Stock [Line Items]
Common Shares, Shares Issued (in shares)	81,149,460	80,979,833
Undesignated Common Stock
Class of Stock [Line Items]
Common Shares, Shares Authorized (in shares)	7,800,000	13,800,000