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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