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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ (23,703)us-gaap_NetIncomeLoss	$ 250us-gaap_NetIncomeLoss
Basic weighted-average common shares outstanding (in shares)	28,047,661us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,738,083us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add: dilutive effect of stock options (in shares)	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	404,170us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Add: dilutive effect of unvested restricted stock (in shares)	0useg_IncrementalCommonSharesOfAttributableToUnvestedRestrictedStock	0useg_IncrementalCommonSharesOfAttributableToUnvestedRestrictedStock
Diluted weighted-average common shares outstanding (in shares)	28,047,661us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	28,142,253us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net (loss) income per share (in dollars per share)	$ (0.85)us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic
Diluted net (loss) income per share (in dollars per share)	$ (0.85)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from computation of earnings per share [Line Items]
Weighted-average anti-dilutive securities (in shares)	2,953,715us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1,055,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Stock Option [Member]
Antidilutive securities excluded from computation of earnings per share [Line Items]
Weighted-average anti-dilutive securities (in shares)	2,616,790us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember	1,055,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Restricted Stock [Member]
Antidilutive securities excluded from computation of earnings per share [Line Items]
Weighted-average anti-dilutive securities (in shares)	336,925us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember	0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of unvested restricted stock arrangements using the treasury stock method.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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