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Consolidated Balance Sheets (Parenthetical) $ in Thousands | Dec. 31, 2017 € / shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 € / shares | Dec. 31, 2016 USD ($) shares
--- | --- | --- | --- | ---
Ordinary share capital, par value (in EUR per share) | € / shares | € 0.01 |  | € 0.01 |
Ordinary share capital, shares authorized (in shares) | shares |  | 350,000,000 |  | 350,000,000
Ordinary share capital, shares issued (in shares) | shares |  | 167,847,345 |  | 187,847,345
Ordinary share capital, shares outstanding (in shares) | shares |  | 152,992,101 |  | 176,247,154
Unvested restricted stock (in shares) | shares |  | 3,007,752 |  | 3,426,810
Treasury stock, at cost, shares (in shares) | shares |  | 14,855,244 |  | 11,600,191
Supplemental balance sheet information - amounts related to assets and liabilities of consolidated VIEs for which creditors do not have recourse to our general credit: |  |  |  |
Restricted cash |  | $ 364,456 |  | $ 329,180
Other assets |  | 979,930 |  | 779,206
Accrued maintenance liability |  | 2,461,799 |  | 2,750,576
Debt |  | 28,420,739 |  | 27,716,999
Consolidated Variable Interest Entities [Member] |  |  |  |
Supplemental balance sheet information - amounts related to assets and liabilities of consolidated VIEs for which creditors do not have recourse to our general credit: |  |  |  |
Restricted cash |  | 162,039 |  | 118,297
Flight equipment held for operating leases, and held for sale |  | 2,220,225 |  | 3,016,373
Other assets |  | 66,155 |  | 50,665
Accrued maintenance liability |  | 44,078 |  | 175,604
Debt |  | 1,522,366 |  | 1,313,807
Liabilities other than accrued maintenance liability and debt |  | $ 93,160 |  | $ 107,207

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