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Summary of Unaudited Quarterly Financial Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 22,999us-gaap_Revenues | $ 14,973us-gaap_Revenues | $ 10,608us-gaap_Revenues | $ 15,958us-gaap_Revenues | $ 14,737us-gaap_Revenues | $ 13,005us-gaap_Revenues | $ 9,580us-gaap_Revenues | $ 11,651us-gaap_Revenues | $ 64,538us-gaap_Revenues | $ 48,973us-gaap_Revenues | $ 31,388us-gaap_Revenues
Total operating costs and expenses | 13,363us-gaap_OperatingCostsAndExpenses | 11,441us-gaap_OperatingCostsAndExpenses | 9,250us-gaap_OperatingCostsAndExpenses | 10,858us-gaap_OperatingCostsAndExpenses | 8,310us-gaap_OperatingCostsAndExpenses | 9,935us-gaap_OperatingCostsAndExpenses | 8,066us-gaap_OperatingCostsAndExpenses | 7,719us-gaap_OperatingCostsAndExpenses | 44,912us-gaap_OperatingCostsAndExpenses | 34,030us-gaap_OperatingCostsAndExpenses | 31,195us-gaap_OperatingCostsAndExpenses
Income tax (expense) benefit | (280)us-gaap_IncomeTaxExpenseBenefit | (124)us-gaap_IncomeTaxExpenseBenefit | 47us-gaap_IncomeTaxExpenseBenefit | (53)us-gaap_IncomeTaxExpenseBenefit | (138)us-gaap_IncomeTaxExpenseBenefit | (60)us-gaap_IncomeTaxExpenseBenefit | (110)us-gaap_IncomeTaxExpenseBenefit | (66)us-gaap_IncomeTaxExpenseBenefit | (410)us-gaap_IncomeTaxExpenseBenefit | (374)us-gaap_IncomeTaxExpenseBenefit | 1,191us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations | 6,730us-gaap_IncomeLossFromContinuingOperations | 777us-gaap_IncomeLossFromContinuingOperations | 1,288us-gaap_IncomeLossFromContinuingOperations | 2,097us-gaap_IncomeLossFromContinuingOperations | 1,869us-gaap_IncomeLossFromContinuingOperations | 1,965us-gaap_IncomeLossFromContinuingOperations | 3,694us-gaap_IncomeLossFromContinuingOperations | 1,304us-gaap_IncomeLossFromContinuingOperations | 12,024us-gaap_IncomeLossFromContinuingOperations | 8,832us-gaap_IncomeLossFromContinuingOperations | (2,674)us-gaap_IncomeLossFromContinuingOperations
Discontinued operations | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2,397us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 191us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2,588us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2,147us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Less: Net loss attributable to noncontrolling interests | (325)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (503)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (304)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  | (1,132)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income | $ 7,055us-gaap_NetIncomeLoss | $ 1,280us-gaap_NetIncomeLoss | $ 1,592us-gaap_NetIncomeLoss | $ 2,097us-gaap_NetIncomeLoss | $ 1,869us-gaap_NetIncomeLoss | $ 1,965us-gaap_NetIncomeLoss | $ 6,091us-gaap_NetIncomeLoss | $ 1,495us-gaap_NetIncomeLoss | $ 12,024us-gaap_NetIncomeLoss | $ 11,420us-gaap_NetIncomeLoss | $ (527)us-gaap_NetIncomeLoss
Basic per share amounts: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in usd per share) | $ 0.35us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.18us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.59us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.43us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations (in usd per share) | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.13us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.11us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income (loss) (in usd per share) | $ 0.35us-gaap_EarningsPerShareBasic | $ 0.06us-gaap_EarningsPerShareBasic | $ 0.08us-gaap_EarningsPerShareBasic | $ 0.10us-gaap_EarningsPerShareBasic | $ 0.09us-gaap_EarningsPerShareBasic | $ 0.10us-gaap_EarningsPerShareBasic | $ 0.30us-gaap_EarningsPerShareBasic | $ 0.07us-gaap_EarningsPerShareBasic | $ 0.59us-gaap_EarningsPerShareBasic | $ 0.56us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic
Diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in usd per share) | $ 0.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.07us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.18us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.56us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.43us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations (in usd per share) | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.11us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income (loss) (in usd per share) | $ 0.34us-gaap_EarningsPerShareDiluted | $ 0.06us-gaap_EarningsPerShareDiluted | $ 0.07us-gaap_EarningsPerShareDiluted | $ 0.10us-gaap_EarningsPerShareDiluted | $ 0.09us-gaap_EarningsPerShareDiluted | $ 0.09us-gaap_EarningsPerShareDiluted | $ 0.30us-gaap_EarningsPerShareDiluted | $ 0.07us-gaap_EarningsPerShareDiluted | $ 0.56us-gaap_EarningsPerShareDiluted | $ 0.55us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares-basic | 19,878,088us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,417,187us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,738,299us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,600,683us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,442,603us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,357,558us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,258,618us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,189,378us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,418,569us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,312,395us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,853,095us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of common shares-diluted | 20,792,363us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,345,311us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,780,034us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,208,023us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,056,156us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,843,742us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,427,360us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,280,030us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,433,177us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,745,454us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,853,095us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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