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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 9,156 | $ 18,063 | $ 12,739
State |  |  |  |  |  |  |  |  | 165 | 23 | 865
Foreign |  |  |  |  |  |  |  |  | 2,124 | 1,657 | 413
Current tax provision |  |  |  |  |  |  |  |  | 11,445 | 19,743 | 14,017
Deferred provision (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 12,914 | 1,575 | (10,335)
State |  |  |  |  |  |  |  |  | 3,589 | 3,366 | 160
Foreign |  |  |  |  |  |  |  |  | (68) | (249) | (192)
Deferred tax provision (benefit) |  |  |  |  |  |  |  |  | 16,435 | 4,692 | (10,367)
Total provision (benefit) for income taxes | $ 1,878 | $ 12,892 | $ 12,942 | $ 167 | $ 5,097 | $ 12,938 | $ 10,163 | $ (3,762) | 27,880 | 24,435 | 3,650
Significant components of the deferred tax provision or benefit |  |  |  |  |  |  |  |  |  |  |
Amortization, depreciation, and basis differences for property, plant and equipment and other long-lived assets |  |  |  |  |  |  |  |  | 21,098 | 3,579 | (13,137)
Amortization of intangibles |  |  |  |  |  |  |  |  | (3,184) | (2,934) | (3,048)
Changes in reserves for workers' compensation and cargo claims |  |  |  |  |  |  |  |  | (674) | (1,970) | (1,751)
Revenue recognition |  |  |  |  |  |  |  |  | 7 | 361 | (1,704)
Allowance for doubtful accounts |  |  |  |  |  |  |  |  | 307 | (501) | 516
Foreign tax credit carryforward utilized |  |  |  |  |  |  |  |  | 434 | 665 | 71
Nonunion pension and other retirement plans |  |  |  |  |  |  |  |  | (234) | (1,595) | 3,493
Deferred compensation plans |  |  |  |  |  |  |  |  | 541 | 350 | 530
Federal net operating loss carryforwards utilized |  |  |  |  |  |  |  |  | 70 | 4,472 | 4,207
State net operating loss carryforwards utilized |  |  |  |  |  |  |  |  | 623 | 2,812 | 254
State depreciation adjustments |  |  |  |  |  |  |  |  | (657) | (539) | 569
Share-based compensation |  |  |  |  |  |  |  |  | (621) | 959 | (1,437)
Valuation allowance increase (decrease) |  |  |  |  |  |  |  |  | 22 | (696) | (1,436)
Leases |  |  |  |  |  |  |  |  | (969) | 237 | 612
Other accrued expenses |  |  |  |  |  |  |  |  | 1,256 | (362) | 3,284
Other |  |  |  |  |  |  |  |  | (1,584) | (146) | (1,390)
Deferred tax provision (benefit) |  |  |  |  |  |  |  |  | $ 16,435 | $ 4,692 | $ (10,367)

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