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Net Income (Loss) Per Share (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Income (Loss) Per Share [Abstract]      
Dilutive restricted stock awards outstanding securities not participate in losses 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Weighted average unvested restricted shares outstanding 157,386us-gaap_WeightedAverageNumberOfSharesRestrictedStock 156,203us-gaap_WeightedAverageNumberOfSharesRestrictedStock 147,200us-gaap_WeightedAverageNumberOfSharesRestrictedStock