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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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