LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-term debt obligations
Long-term debt	$ 155,985	$ 71,012
Less current portion	43,044	24,262
Long-term debt, less current portion	112,941	46,750
Weighted-average interest rate (as a percent)	2.60%
Payments under long-term debt obligations
2013	46,434
2014	33,871
2015	28,269
2016	18,638
2017	36,803
Thereafter	477
Total payments	164,492
Less amounts representing interest	8,507
Long-term debt	155,985	71,012
Term Loan
Long-term debt obligations
Long-term debt	95,000
Interest rate (as a percent)	2.00%
Payments under long-term debt obligations
2013	13,037
2014	15,298
2015	17,510
2016	18,425
2017	36,584
Total payments	100,854
Less amounts representing interest	5,854
Long-term debt	95,000
Notes payable
Long-term debt obligations
Long-term debt	37,756	26,751
Weighted-average interest rate (as a percent)	3.00%
Payments under long-term debt obligations
Long-term debt	37,756	26,751
Notes payable \| Revenue Equipment
Long-term debt obligations
Long-term debt	37,756
Payments under long-term debt obligations
2013	16,443
2014	15,670
2015	7,051
Total payments	39,164
Less amounts representing interest	1,408
Long-term debt	37,756
Capital lease obligations
Long-term debt obligations
Long-term debt	23,229	44,261
Weighted-average interest rate (as a percent)	4.50%
Payments under long-term debt obligations
Long-term debt	23,229	44,261
Capital lease obligations \| Revenue Equipment
Long-term debt obligations
Long-term debt	21,054
Payments under long-term debt obligations
2013	16,458
2014	2,425
2015	3,061
Total payments	21,944
Less amounts representing interest	890
Long-term debt	21,054
Capital lease obligations \| Terminals
Long-term debt obligations
Long-term debt	1,227
Payments under long-term debt obligations
2013	195
2014	200
2015	207
2016	213
2017	219
Thereafter	477
Total payments	1,511
Less amounts representing interest	284
Long-term debt	1,227
Capital lease obligations \| Equipment and Other
Long-term debt obligations
Long-term debt	948
Payments under long-term debt obligations
2013	301
2014	278
2015	440
Total payments	1,019
Less amounts representing interest	71
Long-term debt	$ 948

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Represents aggregate future amounts due of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest.

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Represents amount of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest, due within one year of the latest balance sheet date presented.

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No definition available.

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Represents amount of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest, due after four and within five years of the latest balance sheet date presented.

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No definition available.

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Represents amount of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest, due after three and within four years of the latest balance sheet date presented.

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No definition available.

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Represents amount of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest, due after two and within three years of the latest balance sheet date presented.

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No definition available.

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Represents amount of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest, due after one and within two years of the latest balance sheet date presented.

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No definition available.

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Represents the interest amount by which long-term debt payments are reduced to calculate the present value of long-term debt.

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No definition available.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

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-SubTopic 210

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The effective interest rate at the end of the reporting period.

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-Name Accounting Standards Codification

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-SubTopic 30

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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Obligation related to long-term debt (excluding convertible debt) and capital leases, the portion which is due in one year or less in the future.

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