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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
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 |
OPERATING INCOME | 37,162 | 56,055 | 3,156 | 12,725 | 18,739 | 26,742 | 25,767 | (9,900) | 109,098 |  | 61,348 |  | 34,065 |
Other income (costs) | (16,492) | (2,064) | (2,422) | (3,734) | (2,719) | (2,674) | (1,632) | (2,747) | (24,712) |  | (9,772) |  | (5,778) |
Income tax provision (benefit) | 5,371 | 13,215 | (499) | (963) | (20,548) | 9,280 | 8,358 | (5,240) | 17,124 |  | (8,150) |  | 9,635 |
NET INCOME | $ 15,299 | $ 40,776 | $ 1,233 | $ 9,954 | $ 36,568 | $ 14,788 | $ 15,777 | $ (7,407) | $ 67,262 |  | $ 59,726 |  | $ 18,652 |
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.59 | $ 1.58 | $ 0.05 | $ 0.39 | $ 1.42 | $ 0.57 | $ 0.61 | $ (0.29) | $ 2.61 | [1] | $ 2.32 | [1] | $ 0.72 | [1]
Diluted (in dollars per share) | $ 0.57 | $ 1.52 | $ 0.05 | $ 0.37 | $ 1.37 | $ 0.56 | $ 0.60 | $ (0.29) | $ 2.51 |  | $ 2.25 |  | $ 0.71 |
AVERAGE COMMON SHARES OUTSTANDING |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 25,707,335 | 25,697,509 | 25,670,325 | 25,642,871 | 25,637,568 | 25,671,535 | 25,767,791 | 25,684,475 | 25,679,736 |  | 25,683,745 |  | 25,751,544 |
Diluted (in shares) | 26,682,262 | 26,795,659 | 26,699,549 | 26,596,376 | 26,540,716 | 26,393,359 | 26,291,641 | 25,684,475 | 26,698,831 |  | 26,424,389 |  | 26,256,570 |
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 |  |  |  |  |  |  |  |  |  |  |
Impact of Tax Reform Act |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional tax benefit due to Tax Reform Act |  |  |  |  | $ 25,800 |  |  |  |  |  |  |  |  |
Earnings per diluted share of the tax effects of the Tax Cuts and Jobs Act |  |  |  |  | $ 0.97 |  |  |  |  |  |  |  |  |
Nonunion Defined Benefit Pension Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonunion pension expense |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonunion pension expense, including settlement | $ 12,600 |  |  |  |  |  |  |  | $ 18,195 |  | $ 6,090 |  | $ 3,075 |
Nonunion pension expense, including settlement (after-tax) | $ 9,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Nonunion pension expense, including settlement diluted (in dollars per share) | $ 0.35 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The Company uses the twoclass method for calculating earnings per share. See Note L.

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