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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Leasing equipment, accumulated depreciation and allowances	$ 2,634,305	$ 2,533,446
Accounts receivable, allowances	1,097	1,240
Finite-Lived Intangible Assets, Accumulated Amortization	216,340	205,532
Deferred financing costs	$ 43,684	$ 44,889
Class of Stock [Line Items]
Treasury Stock, Shares (in shares)	4,489,682	1,853,148
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)	3,450,000	0
Preferred Stock, Shares Issued (in shares)	3,450,000	0
Preferred Stock, Shares Outstanding (in shares)	0	0
Designated Common Stock
Class of Stock [Line Items]
Common Shares, Shares Authorized (in shares)	270,000,000	270,000,000
Common Shares, Shares Issued (in shares)	80,982,197	80,843,472
Undesignated Common Stock
Class of Stock [Line Items]
Common Shares, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Shares, Shares Authorized (in shares)	26,550,000	30,000,000

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