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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Cash flows from operating activities: |  |
Net (loss) income | $ (53,634) | $ 243
Adjustments to reconcile net (loss) income to net cash provided by operations |  |
Depreciation, depletion & amortization | 7,306 | 11,702
Change in fair value of commodity price risk management activities, net | (1,002) | (369)
Impairment of oil and gas properties | 43,894 | 0
(Gain) on receipt of Anfield Resources stock | (238) | 0
(Gain) on sale of assets | (57) | (28)
Noncash compensation | 149 | 937
Noncash services | 50 | 76
Accounts payable | 2,548 | 48
Overpayment by operators | (330) | 1,503
Net changes in assets and liabilities | 2,560 | 18
Net cash provided by operating activities | 1,246 | 14,130
Cash flows from investing activities: |  |
Acquisition and development of oil and gas properties | (3,876) | (24,846)
Acquisition of property, plant and equipment | (4) | (1,213)
Proceeds from sale of oil and gas properties | 0 | 11,515
Proceeds from settlement of lawsuit | 1,500 | 0
Proceeds from sale of property and equipment | 136 | 28
Net change in restricted investments | 885 | (51)
Net cash (used in) investing activities: | (1,359) | (14,567)
Cash flows from financing activities: |  |
Issuance of common stock | 0 | (55)
Cancellation of common stock | (20) | 0
Proceeds from new debt | 0 | 8,000
Repayments of debt | 0 | (9,000)
Net cash provided by (used in) financing activities | (20) | (1,055)
Net (decrease) in cash and cash equivalents | (133) | (1,492)
Cash and cash equivalents at beginning of period | 4,010 | 5,855
Cash and cash equivalents at end of period | 3,877 | 4,363
Supplemental disclosures: |  |
Interest paid | 129 | 245
Non-cash investing and financing activities: |  |
Acquisition and development of oil and gas properties through accounts payable | 1,325 | 2,781
Increase in oil and gas properties through asset retirement obligations | $ 62 | $ 243

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- Definition Value of acquisition and development of oil and gas through asset retirement obligations. + References No definition available. + Details
Name: | useg_AcquisitionAndDevelopmentOfOilAndGasThroughAssetRetirementObligations
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in amount of over payments by operators. + References No definition available. + Details
Name: | useg_IncreaseDecreaseInOverPaymentsByOperators
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration