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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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