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

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