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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues | $ 717,418 | $ 787,563 | $ 771,490 | $ 711,839 | $ 774,279 | $ 826,158 | $ 793,350 | $ 700,001 | $ 2,988,310 | $ 3,093,788 | $ 2,826,457
Operating expenses | 728,647 | 756,355 | 736,290 | 703,248 | 737,117 | 770,103 | 790,194 | 687,276 | 2,924,540 | 2,984,690 | 2,765,109
OPERATING INCOME | (11,229) | 31,208 | 35,200 | 8,591 | 37,162 | 56,055 | 3,156 | 12,725 | 63,770 | 109,098 | 61,348
Other income (costs) | (798) | (7,866) | (1,640) | (1,995) | (16,492) | (2,064) | (2,422) | (3,734) | (12,299) | (24,712) | (9,772)
Income tax provision (benefit) | (6,478) | 7,072 | 9,184 | 1,708 | 5,371 | 13,215 | (499) | (963) | 11,486 | 17,124 | (8,150)
NET INCOME | $ (5,549) | $ 16,270 | $ 24,376 | $ 4,888 | $ 15,299 | $ 40,776 | $ 1,233 | $ 9,954 | $ 39,985 | $ 67,262 | $ 59,726
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.22) | $ 0.64 | $ 0.95 | $ 0.19 | $ 0.59 | $ 1.58 | $ 0.05 | $ 0.39 | $ 1.56 | $ 2.61 | $ 2.32
Diluted (in dollars per share) | $ (0.22) | $ 0.62 | $ 0.92 | $ 0.18 | $ 0.57 | $ 1.52 | $ 0.05 | $ 0.37 | $ 1.51 | $ 2.51 | $ 2.25
AVERAGE COMMON SHARES OUTSTANDING |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 25,490,393 | 25,527,982 | 25,554,286 | 25,570,415 | 25,707,335 | 25,697,509 | 25,670,325 | 25,642,871 | 25,535,529 | 25,679,736 | 25,683,745
Diluted (in shares) | 25,490,393 | 26,416,595 | 26,431,592 | 26,512,349 | 26,682,262 | 26,795,659 | 26,699,549 | 26,596,376 | 26,450,055 | 26,698,831 | 26,424,389
Multiemployer pension fund |  |  |  |  |  |  |  |  |  |  |
Multiemployer pension fund withdrawal liability charge (pre-tax) |  |  |  |  |  |  | $ 37,900 |  |  | $ 37,922 |
Multiemployer pension fund withdrawal liability charge (after-tax) |  |  |  |  |  |  | $ 28,200 |  |  |  |
Multiemployer pension fund withdrawal liability charge, diluted (in dollars per share) |  |  |  |  |  |  | $ 1.05 |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |
Noncash impairment charge (pre-tax) | $ 26,500 |  |  |  |  |  |  |  | $ 26,514 |  |
Noncash impairment charge (after-tax) | $ 19,800 |  |  |  |  |  |  |  |  |  |
Noncash impairment charge diluted (in dollars per share) | $ 0.78 |  |  |  |  |  |  |  |  |  |
Nonunion Defined Benefit Pension Plan |  |  |  |  |  |  |  |  |  |  |
Nonunion pension expense |  |  |  |  |  |  |  |  |  |  |
Nonunion pension expense, including settlement (pre-tax) |  |  |  |  | $ 12,600 |  |  |  | $ 5,017 | $ 18,195 | $ 6,090
Nonunion pension expense, including settlement (after-tax) |  |  |  |  | $ 9,400 |  |  |  |  |  |
Nonunion pension expense, including settlement diluted (in dollars per share) |  |  |  |  | $ 0.35 |  |  |  |  |  |
Nonunion pension expense, including settlement and termination expense (pre-tax) |  | $ 6,700 |  |  |  |  |  |  |  |  |
Nonunion pension expense, including settlement and termination expense (after-tax) |  | $ 6,000 |  |  |  |  |  |  |  |  |
Nonunion pension expense per diluted share, including settlement and termination expense (in dollars per share) |  | $ 0.23 |  |  |  |  |  |  |  |  |

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