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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, except Per 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
Allowance for doubtful accounts
Income from operations	$ 4,754us-gaap_OperatingIncomeLoss	$ 6,666us-gaap_OperatingIncomeLoss	$ 5,468us-gaap_OperatingIncomeLoss	$ 5,331us-gaap_OperatingIncomeLoss	$ 4,163us-gaap_OperatingIncomeLoss	$ 8,939us-gaap_OperatingIncomeLoss	$ 10,168us-gaap_OperatingIncomeLoss	$ 7,185us-gaap_OperatingIncomeLoss	$ 22,219us-gaap_OperatingIncomeLoss	$ 30,455us-gaap_OperatingIncomeLoss	$ 15,983us-gaap_OperatingIncomeLoss
Net income	3,811us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,074us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,024us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,276us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	2,059us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,520us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	6,120us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,262us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	14,185us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	17,961us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	8,911us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Diluted (in dollars per share)	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted	$ 0.83us-gaap_EarningsPerShareDiluted	$ 1.06us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted
Correction | Uncollectible Receivables [Member]
Allowance for doubtful accounts
Income from operations										300us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_UncollectibleReceivablesMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net income										$ 200us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_UncollectibleReceivablesMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Diluted (in dollars per share)										$ 0.01us-gaap_EarningsPerShareDiluted / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_UncollectibleReceivablesMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256



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-Topic 260

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