Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Operating revenues, net	$ 204,197us-gaap_SalesRevenueServicesNet	$ 197,071us-gaap_SalesRevenueServicesNet
Expenses:
Direct expenses	169,207us-gaap_OperatingCostsAndExpenses	158,653us-gaap_OperatingCostsAndExpenses
Selling, general and administrative expenses	11,237	9,328
Total operating expenses	180,444us-gaap_OperatingExpenses	167,981us-gaap_OperatingExpenses
(Gain) loss on asset dispositions	(7)us-gaap_GainLossOnDispositionOfAssets	1,073us-gaap_GainLossOnDispositionOfAssets
Equity in loss of unconsolidated affiliate	68	41
Operating income	23,692us-gaap_OperatingIncomeLoss	27,976us-gaap_OperatingIncomeLoss
Interest expense	7,170us-gaap_InterestExpense	7,364us-gaap_InterestExpense
Loss on debt extinguishment		29,216
Other income, net	(462)us-gaap_OtherNonoperatingIncomeExpense	(91)us-gaap_OtherNonoperatingIncomeExpense
Total expenses	6,708us-gaap_NonoperatingIncomeExpense	36,489us-gaap_NonoperatingIncomeExpense
Earnings (loss) before income taxes	16,984	(8,513)
Income tax expense (benefit)	6,621us-gaap_IncomeTaxExpenseBenefit	(3,192)us-gaap_IncomeTaxExpenseBenefit
Net earnings (loss)	$ 10,363us-gaap_NetIncomeLoss	$ (5,321)us-gaap_NetIncomeLoss
Weighted average shares outstanding:
Basic	15,579	15,480
Diluted	15,662	15,480
Net earnings (loss) per share:
Basic	$ 0.67us-gaap_EarningsPerShareBasic	$ (0.34)us-gaap_EarningsPerShareBasic
Diluted	$ 0.66us-gaap_EarningsPerShareDiluted	$ (0.34)us-gaap_EarningsPerShareDiluted

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