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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 309,766 |  | $ 207,681 |
Accounts receivable, net | 445,506 |  | 206,336 |
Derivative contracts | 71,022 |  | 4,066 |
Inventories | 3,618 |  | 6,903 |
Costs in excess of billings | 11,229 |  | 0 |
Prepaid expenses | 31,319 |  | 14,099 |
Restricted deposit | 255,000 |  | 0 |
Other current assets | 15,425 |  | 2,755 |
Total current assets | 1,142,885 |  | 441,840 |
Oil and natural gas properties, using full cost method of accounting |  |  |  |
Proved (includes development and project costs excluded from amortization of $72.4 million and $231.3 million at December 31, 2012 and 2011, respectively) | 12,262,921 | [1] | 8,969,296 | [1]
Unproved | 865,863 |  | 689,393 |
Less: accumulated depreciation, depletion and impairment | (5,231,182) |  | (4,791,534) |
Net oil and natural gas properties capitalized costs | 7,897,602 |  | 4,867,155 |
Other property, plant and equipment, net | 582,375 |  | 522,269 |
Restricted deposits | 27,947 |  | 27,912 |
Derivative contracts | 23,617 |  | 26,415 |
Goodwill | 0 |  | 235,396 |
Other assets | 116,305 |  | 98,622 |
Total assets | 9,790,731 |  | 6,219,609 |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 |  | 1,051 |
Accounts payable and accrued expenses | 766,544 |  | 506,784 |
Billings and estimated contract loss in excess of costs incurred | 15,546 |  | 43,320 |
Derivative contracts | 14,860 |  | 115,435 |
Asset retirement obligations | 118,504 |  | 32,906 |
Deposit on pending sale | 255,000 |  | 0 |
Total current liabilities | 1,170,454 |  | 699,496 |
Long-term debt | 4,301,083 |  | 2,813,125 |
Derivative contracts | 59,787 |  | 49,695 |
Asset retirement obligations | 379,906 |  | 95,210 |
Other long-term obligations | 17,046 |  | 13,133 |
Total liabilities | 5,928,276 |  | 3,670,659 |
Commitments and contingencies (Note 16) |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Common stock, $0.001 par value, 800,000 shares authorized; 491,578 issued and 490,359 outstanding at December 31, 2012 and 412,827 issued and 411,953 outstanding at December 31, 2011 | 476 |  | 399 |
Additional paid-in capital | 5,233,019 |  | 4,568,856 |
Additional paid-in capital - stockholder receivable | (5,000) |  | 0 |
Treasury stock, at cost | (8,602) |  | (6,158) |
Accumulated deficit | (2,851,048) |  | (2,937,094) |
Total SandRidge Energy, Inc. stockholders' equity | 2,368,853 |  | 1,626,011 |
Noncontrolling interest | 1,493,602 |  | 922,939 |
Total equity | 3,862,455 |  | 2,548,950 |
Total liabilities and equity | 9,790,731 |  | 6,219,609 |
8.5% Convertible perpetual preferred stock |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Preferred stock | 3 |  | 3 |
6.0% Convertible perpetual preferred stock |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Preferred stock | 2 |  | 2 |
7.0% Convertible perpetual preferred stock |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Preferred stock | $ 3 |  | $ 3 |
[1] | Includes cumulative capitalized interest on oil and natural gas properties of $11.7 million and $1.6 million at December 31, 2012 and 2011, respectively.

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