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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 1,179,644 |  | $ 814,663 |
Accounts receivable, net | 293,765 |  | 349,218 |
Derivative contracts | 9,002 |  | 12,779 |
Costs in excess of billings and contract loss | 4,144 |  | 4,079 |
Prepaid expenses | 13,567 |  | 39,253 |
Other current assets | 25,823 |  | 21,831 |
Total current assets | 1,525,945 |  | 1,241,823 |
Oil and natural gas properties, using full cost method of accounting |  |  |  |
Proved | 10,443,534 | [1] | 10,972,816 | [1]
Unproved | 292,459 |  | 531,606 |
Less: accumulated depreciation, depletion and impairment | (6,043,109) |  | (5,762,969) |
Net oil and natural gas properties capitalized costs | 4,692,884 |  | 5,741,453 |
Other property, plant and equipment, net | 559,342 |  | 566,222 |
Derivative contracts | 18,048 |  | 14,126 |
Other assets | 82,038 |  | 121,171 |
Total assets | 6,878,257 |  | 7,684,795 |
Current liabilities |  |  |  |
Accounts payable and accrued expenses | 581,764 |  | 812,488 |
Derivative contracts | 14,175 |  | 34,267 |
Asset retirement obligations | 0 |  | 87,063 |
Other current liabilities | 16,467 |  | 0 |
Total current liabilities | 612,406 |  | 933,818 |
Long-term debt | 3,195,036 |  | 3,194,907 |
Derivative contracts | 0 |  | 20,564 |
Asset retirement obligations | 53,103 |  | 337,054 |
Other long-term obligations | 20,173 |  | 22,825 |
Total liabilities | 3,880,718 |  | 4,509,168 |
Commitments and contingencies (Note 10) |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Common stock, $0.001 par value, 800,000 shares authorized; 495,719 issued and 494,651 outstanding at March 31, 2014 and 491,609 issued and 490,290 outstanding at December 31, 2013 | 485 |  | 483 |
Additional paid-in capital | 5,302,051 |  | 5,298,301 |
Additional paid-in capital—stockholder receivable | (3,750) |  | (3,750) |
Treasury stock, at cost | (6,898) |  | (8,770) |
Accumulated deficit | (3,602,358) |  | (3,460,462) |
Total SandRidge Energy, Inc. stockholders’ equity | 1,689,538 |  | 1,825,810 |
Noncontrolling interest | 1,308,001 |  | 1,349,817 |
Total equity | 2,997,539 |  | 3,175,627 |
Total liabilities and equity | 6,878,257 |  | 7,684,795 |
8.5% Convertible perpetual preferred stock; 2,650 shares issued and outstanding at March 31, 2014 and December 31, 2013; aggregate liquidation preference of $265,000 |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Preferred stock | 3 |  | 3 |
6.0% Convertible perpetual preferred stock; 2,000 shares issued and outstanding at March 31, 2014 and December 31, 2013; aggregate liquidation preference of $200,000 |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Preferred stock | 2 |  | 2 |
7.0% Convertible perpetual preferred stock; 3,000 shares issued and outstanding at March 31, 2014 and December 31, 2013; aggregate liquidation preference of $300,000 |  |  |  |
Preferred stock, $0.001 par value, 50,000 shares authorized |  |  |  |
Preferred stock | $ 3 |  | $ 3 |
[1] | Includes cumulative capitalized interest of approximately $25.9 million and $23.4 million at March 31, 2014 and December 31, 2013, respectively.

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