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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 835,941us-gaap_SalesRevenueServicesNet	$ 848,449us-gaap_SalesRevenueServicesNet
Transportation costs	746,813us-gaap_CostOfServices	759,705us-gaap_CostOfServices
Gross margin	89,128us-gaap_GrossProfit	88,744us-gaap_GrossProfit
Costs and expenses:
Salaries and benefits	39,476us-gaap_LaborAndRelatedExpense	37,092us-gaap_LaborAndRelatedExpense
Agent fees and commissions	14,826us-gaap_SalesCommissionsAndFees	13,666us-gaap_SalesCommissionsAndFees
General and administrative	14,071us-gaap_GeneralAndAdministrativeExpense	15,432us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	1,960us-gaap_DepreciationAndAmortization	2,058us-gaap_DepreciationAndAmortization
Total costs and expenses	70,333us-gaap_OperatingExpenses	68,248us-gaap_OperatingExpenses
Operating income	18,795us-gaap_OperatingIncomeLoss	20,496us-gaap_OperatingIncomeLoss
Other income (expense):
Interest expense	(741)us-gaap_InterestExpense	(407)us-gaap_InterestExpense
Interest and dividend income	6us-gaap_InvestmentIncomeInterestAndDividend	14us-gaap_InvestmentIncomeInterestAndDividend
Other, net	(1,404)us-gaap_OtherNonoperatingIncomeExpense	(205)us-gaap_OtherNonoperatingIncomeExpense
Total other expense	(2,139)us-gaap_NonoperatingIncomeExpense	(598)us-gaap_NonoperatingIncomeExpense
Income before provision for income taxes	16,656us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	19,898us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	6,380us-gaap_IncomeTaxExpenseBenefit	7,863us-gaap_IncomeTaxExpenseBenefit
Net income	10,276us-gaap_NetIncomeLoss	12,035us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Foreign currency translation adjustments	3us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(13)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total comprehensive income	$ 10,279us-gaap_ComprehensiveIncomeNetOfTax	$ 12,022us-gaap_ComprehensiveIncomeNetOfTax
Basic earnings per common share	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted
Basic weighted average number of shares outstanding	36,156us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	36,661us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average number of shares outstanding	36,169us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	36,724us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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