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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Leasing equipment, accumulated depreciation and allowances | $ 3,782,025 | $ 3,370,652
Accounts receivable, allowances | 1,250 | 2,192
Finite-Lived Intangible Assets, Accumulated Amortization | 277,631 | 264,791
Deferred financing costs | $ 62,630 | $ 42,747
Class of Stock [Line Items] |  |
Treasury Stock, Shares (in shares) | 14,280,091 | 13,901,326
Preferred Shares |  |
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, Par Value (in dollars per share) | $ 0.01 | $ 0.01
Common Shares, Shares Authorized (in shares) | 270,000,000 | 270,000,000
Common Shares, Shares Issued (in shares) | 81,296,359 | 81,151,723
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) | 800,000 | 7,800,000
Common Shares, Shares Outstanding (in shares) | 0 | 0
Common Shares, Shares Issued (in shares) | 0 | 0

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