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Quarterly Financial Information (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
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
OPERATING REVENUE | $ 202,997 us-gaap_Revenues | $ 217,092 us-gaap_Revenues | $ 226,785 us-gaap_Revenues | $ 224,481 us-gaap_Revenues | $ 183,348 us-gaap_Revenues | $ 130,645 us-gaap_Revenues | $ 133,992 us-gaap_Revenues | $ 134,273 us-gaap_Revenues | $ 871,355 us-gaap_Revenues | $ 582,257 us-gaap_Revenues | $ 545,745 us-gaap_Revenues
Operating Income (Loss) | 34,247 us-gaap_OperatingIncomeLoss | 36,290 us-gaap_OperatingIncomeLoss | 40,642 us-gaap_OperatingIncomeLoss | 20,688 us-gaap_OperatingIncomeLoss | 26,720 us-gaap_OperatingIncomeLoss | 26,000 us-gaap_OperatingIncomeLoss | 29,375 us-gaap_OperatingIncomeLoss | 30,207 us-gaap_OperatingIncomeLoss | 131,868 us-gaap_OperatingIncomeLoss | 112,302 us-gaap_OperatingIncomeLoss | 94,901 us-gaap_OperatingIncomeLoss
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 34,216 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 36,214 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 40,616 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 20,569 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 26,596 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 26,126 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 29,504 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 30,330 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 131,617 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 112,556 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 95,575 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | $ 21,544 us-gaap_NetIncomeLoss | $ 22,737 us-gaap_NetIncomeLoss | $ 26,472 us-gaap_NetIncomeLoss | $ 14,079 us-gaap_NetIncomeLoss | $ 15,842 us-gaap_NetIncomeLoss | $ 15,868 us-gaap_NetIncomeLoss | $ 19,138 us-gaap_NetIncomeLoss | $ 19,734 us-gaap_NetIncomeLoss | $ 84,834 us-gaap_NetIncomeLoss | $ 70,582 us-gaap_NetIncomeLoss | $ 61,541 us-gaap_NetIncomeLoss
Basic EPS | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.97 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ 0.72 us-gaap_EarningsPerShareBasic
Diluted EPS | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.96 us-gaap_EarningsPerShareDiluted | $ 0.83 us-gaap_EarningsPerShareDiluted | $ 0.71 us-gaap_EarningsPerShareDiluted

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