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INCOME TAXES (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax benefit of options exercised and dividends on share-based payment awards |  |  |  |  |  |  |  |  | $ 200,000 |  |
Current provision (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 12,739,000 | 0 | (872,000)
State |  |  |  |  |  |  |  |  | 865,000 | 694,000 | 487,000
Foreign |  |  |  |  |  |  |  |  | 413,000 | 405,000 | 489,000
Current provision (benefit) |  |  |  |  |  |  |  |  | 14,017,000 | 1,099,000 | 104,000
Deferred provision (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (10,335,000) | (8,656,000) | 2,664,000
State |  |  |  |  |  |  |  |  | 160,000 | (1,699,000) | 415,000
Foreign |  |  |  |  |  |  |  |  | (192,000) | (4,000) | (23,000)
Deferred tax provision (benefit) |  |  |  |  |  |  |  |  | (10,367,000) | (10,359,000) | 3,056,000
Total provision (benefit) for income taxes | 3,549,000 | 7,022,000 | 2,987,000 | (9,908,000) | (4,387,000) | 5,258,000 | (5,757,000) | (4,374,000) | 3,650,000 | (9,260,000) | 3,160,000
Significant components of the deferred tax provision or benefit |  |  |  |  |  |  |  |  |  |  |
Amortization, depreciation, and basis differences for property, plant and equipment and other long-lived assets |  |  |  |  |  |  |  |  | (13,137,000) | 137,000 | 15,059,000
Amortization of intangibles |  |  |  |  |  |  |  |  | (3,048,000) | (1,604,000) | 0
Changes in reserves for workers' compensation and cargo claims |  |  |  |  |  |  |  |  | (1,751,000) | (3,319,000) | (970,000)
Revenue recognition |  |  |  |  |  |  |  |  | (1,704,000) | (253,000) | 654,000
Allowance for doubtful accounts |  |  |  |  |  |  |  |  | 516,000 | 229,000 | (705,000)
Foreign tax credit carryforward |  |  |  |  |  |  |  |  | 71,000 | (133,000) | (240,000)
Nonunion pension and other retirement plans |  |  |  |  |  |  |  |  | 3,493,000 | 702,000 | (4,885,000)
Deferred compensation plans |  |  |  |  |  |  |  |  | 530,000 | 669,000 | 853,000
Federal net operating loss carryforwards |  |  |  |  |  |  |  |  | 4,207,000 | (2,538,000) | (680,000)
State net operating loss carryforwards |  |  |  |  |  |  |  |  | 254,000 | (725,000) | 705,000
State depreciation adjustments |  |  |  |  |  |  |  |  | 569,000 | 20,000 | (1,179,000)
Share-based compensation |  |  |  |  |  |  |  |  | (1,437,000) | (702,000) | (941,000)
Valuation allowance decrease |  |  |  |  |  |  |  |  | (1,436,000) | (3,180,000) | (782,000)
Leases |  |  |  |  |  |  |  |  | 612,000 | 806,000 | (316,000)
Other accrued expenses |  |  |  |  |  |  |  |  | 3,284,000 | (1,586,000) | (863,000)
Other |  |  |  |  |  |  |  |  | (1,390,000) | 1,118,000 | (2,654,000)
Deferred tax provision (benefit) |  |  |  |  |  |  |  |  | $ (10,367,000) | $ (10,359,000) | $ 3,056,000

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