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Quarterly 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
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 813,854 us-gaap_Revenues | $ 834,633 us-gaap_Revenues | $ 816,574 us-gaap_Revenues | $ 772,386 us-gaap_Revenues | $ 804,368 us-gaap_Revenues | $ 850,740 us-gaap_Revenues | $ 839,130 us-gaap_Revenues | $ 803,487 us-gaap_Revenues | $ 3,237,447 us-gaap_Revenues | $ 3,297,725 us-gaap_Revenues | $ 3,534,372 us-gaap_Revenues
Operating income | (19,702)us-gaap_OperatingIncomeLoss | 59,080 us-gaap_OperatingIncomeLoss | 13,244 us-gaap_OperatingIncomeLoss | (27,774)us-gaap_OperatingIncomeLoss | 30,820 us-gaap_OperatingIncomeLoss | 56,174 us-gaap_OperatingIncomeLoss | 50,555 us-gaap_OperatingIncomeLoss | 15,561 us-gaap_OperatingIncomeLoss | 24,848 us-gaap_OperatingIncomeLoss | 153,111 us-gaap_OperatingIncomeLoss | 165,987 us-gaap_OperatingIncomeLoss
Net Income (loss) | $ (27,868)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 41,338 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (14,737)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (22,887)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 8,609 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 26,394 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,720 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,233 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (24,154)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 58,956 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 51,157 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.54)us-gaap_EarningsPerShareBasic | $ 0.81 us-gaap_EarningsPerShareBasic | $ (0.29)us-gaap_EarningsPerShareBasic | $ (0.44)us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ (0.47)us-gaap_EarningsPerShareBasic | $ 1.14 us-gaap_EarningsPerShareBasic | $ 1.00 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ (0.54)us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ (0.29)us-gaap_EarningsPerShareDiluted | $ (0.44)us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ (0.47)us-gaap_EarningsPerShareDiluted | $ 1.12 us-gaap_EarningsPerShareDiluted | $ 0.99 us-gaap_EarningsPerShareDiluted
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 51,174 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,127 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,183 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,467 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,228 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,881 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,881 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,763 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,237 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,688 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51,090 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 51,174 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,036 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,183 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,467 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,034 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,610 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,547 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,497 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,237 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,422 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,746 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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