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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accumulated depreciation | $ 11,356 | $ 8,666
Receivables, allowances | $ 1,372 | $ 1,730
Redeemable preferred stock - par value (in dollars per share) | $ 0.01 | $ 0.01
Redeemable preferred stock - shares authorized (in shares) | 2,500,000 | 2,500,000
Redeemable preferred stock - shares issued (in shares) | 2,500,000 | 2,500,000
Redeemable preferred stock - shares outstanding (in shares) | 2,500,000 | 2,500,000
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 20,000,000 | 20,000,000
Common stock, shares issued (in shares) | 6,570,000 | 6,356,000
Accumulated other comprehensive loss, income tax expense (benefit) | $ 1,428 | $ 896
Restricted cash | 36,385 | 56,948
Maintenance rights | 20,097 | 3,133
Spare parts inventory | 59,434 | 41,759
Other assets | 43,778 | 28,038
Debt obligations | 1,693,753 | 1,251,006
Variable Interest Entity |  |
Cash | 0 | 134
Restricted cash | 35,262 | 56,523
Equipment | 1,037,684 | 1,004,851
Maintenance rights | 767 | 3,133
Spare parts inventory | 5,437 | 2,832
Other assets | 558 | 668
Debt obligations | 907,550 | 842,996
Assets Leased to Others |  |
Accumulated depreciation | $ 454,123 | $ 414,835

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