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

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