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QUARTERLY FINANCIAL DATA - (UNAUDITED) (Details) (USD $)	3 Months Ended									9 Months Ended		12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
QUARTERLY FINANCIAL DATA - (UNAUDITED)
Revenues	$ 26,094,909us-gaap_SalesRevenueServicesNet	$ 18,728,000us-gaap_SalesRevenueServicesNet	$ 21,115,045us-gaap_SalesRevenueServicesNet	$ 31,487,000us-gaap_SalesRevenueServicesNet	$ 63,204,000us-gaap_SalesRevenueServicesNet	$ 57,053,000us-gaap_SalesRevenueServicesNet	$ 41,835,000us-gaap_SalesRevenueServicesNet	$ 30,384,000us-gaap_SalesRevenueServicesNet	$ 67,045,000us-gaap_SalesRevenueServicesNet	$ 93,133,099us-gaap_SalesRevenueServicesNet	$ 115,806,689us-gaap_SalesRevenueServicesNet	$ 134,534,540us-gaap_SalesRevenueServicesNet	$ 196,317,215us-gaap_SalesRevenueServicesNet	$ 151,028,582us-gaap_SalesRevenueServicesNet
Income (loss) from operations	(5,973,323)us-gaap_OperatingIncomeLoss	(6,836,000)us-gaap_OperatingIncomeLoss	(5,826,611)us-gaap_OperatingIncomeLoss	(5,620,000)us-gaap_OperatingIncomeLoss	10,905,000us-gaap_OperatingIncomeLoss	7,069,000us-gaap_OperatingIncomeLoss	2,096,000us-gaap_OperatingIncomeLoss	(2,860,000)us-gaap_OperatingIncomeLoss	20,475,000us-gaap_OperatingIncomeLoss	(5,209,732)us-gaap_OperatingIncomeLoss	(542,040)us-gaap_OperatingIncomeLoss	(7,378,074)us-gaap_OperatingIncomeLoss	26,779,411us-gaap_OperatingIncomeLoss	18,164,890us-gaap_OperatingIncomeLoss
Net income (loss)	$ (4,009,477)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (4,712,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (3,951,687)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (4,004,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 6,351,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,150,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,112,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (1,974,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 12,384,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (3,761,777)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (1,604,244)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (6,316,041)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 15,671,879us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 10,833,215us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss) per share basic	$ (0.18)us-gaap_EarningsPerShareBasic	$ (0.21)us-gaap_EarningsPerShareBasic	$ (0.18)us-gaap_EarningsPerShareBasic	$ (0.18)us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ (0.09)us-gaap_EarningsPerShareBasic	$ 0.58us-gaap_EarningsPerShareBasic	$ (0.17)us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ (0.29)us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic
Net income (loss) per share diluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.21)us-gaap_EarningsPerShareDiluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ (0.09)us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ (0.17)us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ (0.29)us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted

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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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