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Selected 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 Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 341,624 us-gaap_SalesRevenueNet |  | $ 320,099 us-gaap_SalesRevenueNet |  | $ 319,295 us-gaap_SalesRevenueNet |  | $ 312,165 us-gaap_SalesRevenueNet |  | $ 303,833 us-gaap_SalesRevenueNet |  | $ 298,549 us-gaap_SalesRevenueNet |  | $ 273,604 us-gaap_SalesRevenueNet |  | $ 273,904 us-gaap_SalesRevenueNet |  |  |  |
Operating costs and expenses | 320,499 us-gaap_OperatingCostsAndExpenses |  | 355,132 us-gaap_OperatingCostsAndExpenses |  | 298,055 us-gaap_OperatingCostsAndExpenses |  | 289,417 us-gaap_OperatingCostsAndExpenses |  | 298,616 us-gaap_OperatingCostsAndExpenses |  | 278,540 us-gaap_OperatingCostsAndExpenses |  | 253,965 us-gaap_OperatingCostsAndExpenses |  | 255,981 us-gaap_OperatingCostsAndExpenses |  |  |  |
Income before income taxes | 21,619 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | (35,083)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 22,043 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 23,129 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 6,481 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 21,193 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 19,858 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 18,957 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 31,708 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 66,489 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 70,264 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | $ 15,472 us-gaap_NetIncomeLoss |  | $ (22,182)us-gaap_NetIncomeLoss |  | $ 13,921 us-gaap_NetIncomeLoss |  | $ 14,639 us-gaap_NetIncomeLoss |  | $ 5,452 us-gaap_NetIncomeLoss |  | $ 13,790 us-gaap_NetIncomeLoss |  | $ 12,933 us-gaap_NetIncomeLoss |  | $ 14,954 us-gaap_NetIncomeLoss |  | $ 21,850 us-gaap_NetIncomeLoss | $ 47,129 us-gaap_NetIncomeLoss | $ 44,214 us-gaap_NetIncomeLoss
Basic earnings per common share (in dollars per share) | $ 0.22 us-gaap_EarningsPerShareBasic | [1] | $ (0.31)us-gaap_EarningsPerShareBasic | [1] | $ 0.20 us-gaap_EarningsPerShareBasic | [1] | $ 0.21 us-gaap_EarningsPerShareBasic | [1] | $ 0.08 us-gaap_EarningsPerShareBasic | [1] | $ 0.20 us-gaap_EarningsPerShareBasic | [1] | $ 0.19 us-gaap_EarningsPerShareBasic | [1] | $ 0.22 us-gaap_EarningsPerShareBasic | [1] | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 0.65 us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share) | $ 0.22 us-gaap_EarningsPerShareDiluted | [1] | $ (0.31)us-gaap_EarningsPerShareDiluted | [1] | $ 0.20 us-gaap_EarningsPerShareDiluted | [1] | $ 0.21 us-gaap_EarningsPerShareDiluted | [1] | $ 0.08 us-gaap_EarningsPerShareDiluted | [1] | $ 0.20 us-gaap_EarningsPerShareDiluted | [1] | $ 0.19 us-gaap_EarningsPerShareDiluted | [1] | $ 0.22 us-gaap_EarningsPerShareDiluted | [1] | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.65 us-gaap_EarningsPerShareDiluted
Cash dividends per common share (in dollars per share) | $ 0.175 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17375 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17250 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17125 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.16875 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.1675 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.16625 us-gaap_CommonStockDividendsPerShareCashPaid | [1] |  |  |
[1] | Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.

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