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ACCOUNTING POLICIES (Adopted Accounting Pronouncements) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Adopted Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ 501,389 |  |  |  | $ 438,379 |  |  |  | $ 501,389 | $ 438,379 |
Revenues |  | 774,279 | $ 826,158 | $ 793,350 | $ 700,001 | 710,721 | $ 744,280 | $ 720,368 | $ 651,088 | 3,093,788 | 2,826,457 | $ 2,700,219
Operating expenses |  | 737,117 | 770,103 | 790,194 | 687,276 | 691,982 | 717,538 | 694,601 | 660,988 | 2,984,690 | 2,765,109 | 2,666,154
Increase in other cost |  |  |  |  |  |  |  |  |  | 19,158 | 4,723 | 2,151
Net income |  | 15,299 | $ 40,776 | $ 1,233 | $ 9,954 | 36,568 | $ 14,788 | $ 15,777 | $ (7,407) | 67,262 | 59,726 | 18,652
Additional paid-in capital |  | 325,712 |  |  |  | 319,436 |  |  |  | 325,712 | 319,436 |
Noncurrent deferred tax liabilities |  | $ 56,441 |  |  |  | $ 49,157 |  |  |  | 56,441 | 49,157 |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |
Adopted Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 67,262 | 59,726 | 18,652
ASC Topic 715, Compensation – Retirement Benefits | Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Adopted Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  | (7,800) | (5,100)
Increase in other cost |  |  |  |  |  |  |  |  |  |  | $ 7,800 | $ 5,100
Net income |  |  |  |  |  |  |  |  |  | $ 0 |  |
EPS (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.00 |  |
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |
Adopted Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI to Retained earnings tax effect | $ (3,600) |  |  |  |  |  |  |  |  |  |  |
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |
Adopted Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from AOCI to Retained earnings tax effect | 3,600 |  |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC Topic 606, Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |  |
Adopted Accounting Pronouncements |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 400 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 700 |  |
Purchased transportation |  |  |  |  |  |  |  |  |  | $ 700 |  |

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