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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Details) (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
Revenue:
Total revenue	$ 72,040us-gaap_SalesRevenueNet	$ 69,712us-gaap_SalesRevenueNet	$ 76,518us-gaap_SalesRevenueNet	$ 78,288us-gaap_SalesRevenueNet	$ 73,422us-gaap_SalesRevenueNet	$ 73,294us-gaap_SalesRevenueNet	$ 57,919us-gaap_SalesRevenueNet	$ 66,866us-gaap_SalesRevenueNet	$ 296,558us-gaap_SalesRevenueNet	$ 271,501us-gaap_SalesRevenueNet	$ 234,051us-gaap_SalesRevenueNet
Operating costs and expenses:
Total operating costs and expenses	54,455us-gaap_CostsAndExpenses	55,244us-gaap_CostsAndExpenses	56,414us-gaap_CostsAndExpenses	55,099us-gaap_CostsAndExpenses	67,208us-gaap_CostsAndExpenses	64,229us-gaap_CostsAndExpenses	52,175us-gaap_CostsAndExpenses	65,425us-gaap_CostsAndExpenses	221,212us-gaap_CostsAndExpenses	249,037us-gaap_CostsAndExpenses	324,485us-gaap_CostsAndExpenses
Operating income (loss)	17,585us-gaap_OperatingIncomeLoss	14,468us-gaap_OperatingIncomeLoss	20,104us-gaap_OperatingIncomeLoss	23,189us-gaap_OperatingIncomeLoss	6,214us-gaap_OperatingIncomeLoss	9,065us-gaap_OperatingIncomeLoss	5,744us-gaap_OperatingIncomeLoss	1,441us-gaap_OperatingIncomeLoss	75,346us-gaap_OperatingIncomeLoss	22,464us-gaap_OperatingIncomeLoss	(90,434)us-gaap_OperatingIncomeLoss
Net Income (loss)	$ 7,841us-gaap_NetIncomeLoss	$ 5,513us-gaap_NetIncomeLoss	$ 5,043us-gaap_NetIncomeLoss	$ 7,804us-gaap_NetIncomeLoss	$ (9,777)us-gaap_NetIncomeLoss	$ (5,725)us-gaap_NetIncomeLoss	$ (7,844)us-gaap_NetIncomeLoss	$ (10,402)us-gaap_NetIncomeLoss	$ 26,201us-gaap_NetIncomeLoss	$ (33,748)us-gaap_NetIncomeLoss	$ (134,336)us-gaap_NetIncomeLoss
Net income (loss) per share:
Net income (loss) per share - basic (in dollars per share)	$ 0.07us-gaap_EarningsPerShareBasicUndistributed	$ 0.05us-gaap_EarningsPerShareBasicUndistributed	$ 0.04us-gaap_EarningsPerShareBasicUndistributed	$ 0.07us-gaap_EarningsPerShareBasicUndistributed	$ (0.09)us-gaap_EarningsPerShareBasicUndistributed	$ (0.05)us-gaap_EarningsPerShareBasicUndistributed	$ (0.07)us-gaap_EarningsPerShareBasicUndistributed	$ (0.09)us-gaap_EarningsPerShareBasicUndistributed	$ 0.23us-gaap_EarningsPerShareBasicUndistributed	$ (0.30)us-gaap_EarningsPerShareBasicUndistributed	$ (1.21)us-gaap_EarningsPerShareBasicUndistributed
Net income (loss) per share - diluted (in dollars per share)	$ 0.07us-gaap_EarningsPerShareDilutedUndistributed	$ 0.05us-gaap_EarningsPerShareDilutedUndistributed	$ 0.04us-gaap_EarningsPerShareDilutedUndistributed	$ 0.07us-gaap_EarningsPerShareDilutedUndistributed	$ (0.09)us-gaap_EarningsPerShareDilutedUndistributed	$ (0.05)us-gaap_EarningsPerShareDilutedUndistributed	$ (0.07)us-gaap_EarningsPerShareDilutedUndistributed	$ (0.09)us-gaap_EarningsPerShareDilutedUndistributed	$ 0.22us-gaap_EarningsPerShareDilutedUndistributed	$ (0.30)us-gaap_EarningsPerShareDilutedUndistributed	$ (1.21)us-gaap_EarningsPerShareDilutedUndistributed
Shares used in per share calculations:
Basic (in shares)	115,024us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	114,523us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	114,116us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,590us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	112,640us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	112,183us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	111,599us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	114,318us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	112,415us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	110,769us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	117,620us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	118,206us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	117,398us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	116,629us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	113,217us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	112,640us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	112,183us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	111,599us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	117,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	112,415us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	110,769us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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