Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Leasing equipment, accumulated depreciation and allowances	$ 3,065,931	$ 2,933,886
Accounts receivable, allowances	5,522	1,276
Finite-Lived Intangible Assets, Accumulated Amortization	248,509	242,301
Deferred financing costs	$ 36,883	$ 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)	10,136,965	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)	81,110,868	80,979,833
Undesignated Common Stock
Class of Stock [Line Items]
Common Shares, Shares Authorized (in shares)	7,800,000	13,800,000