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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.