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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
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Dec. 31, 2017
USD ($)
$ / shares
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Dec. 31, 2016
USD ($)
$ / shares
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Dec. 31, 2015
USD ($)
$ / shares
shares
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)                      
Revenues $ 710,721 $ 744,280 $ 720,368 $ 651,088 $ 688,214 $ 713,923 $ 676,627 $ 621,455 $ 2,826,457 $ 2,700,219 $ 2,666,905
Operating expenses 694,041 719,931 695,634 663,341 687,003 693,553 659,973 630,720 2,772,947 2,671,249 2,591,409
OPERATING INCOME (LOSS) 16,680 24,349 24,734 (12,253) 1,211 20,370 16,654 (9,265) 53,510 28,970 75,496
Other income (costs) (660) (281) (599) (394) (115) 185 (273) (480) (1,934) (683) (2,762)
Income tax provision (benefit) (20,548) 9,280 8,358 (5,240) (488) 7,615 6,150 (3,642) (8,150) 9,635 27,880
NET INCOME (LOSS) $ 36,568 $ 14,788 $ 15,777 $ (7,407) $ 1,584 $ 12,940 $ 10,231 $ (6,103) $ 59,726 $ 18,652 $ 44,854
Earnings (loss) per common share                      
Basic (in dollars per share) | $ / shares $ 1.42 $ 0.57 $ 0.61 $ (0.29) $ 0.06 $ 0.50 $ 0.39 $ (0.24) $ 2.32 $ 0.72 $ 1.71
Diluted (in dollars per share) | $ / shares $ 1.37 $ 0.56 $ 0.60 $ (0.29) $ 0.06 $ 0.49 $ 0.39 $ (0.24) $ 2.25 $ 0.71 $ 1.67
AVERAGE COMMON SHARES OUTSTANDING                      
Basic (in shares) | shares 25,637,568 25,671,535 25,767,791 25,684,475 25,669,280 25,724,550 25,791,026 25,822,522 25,683,745 25,751,544 26,013,716
Diluted (in shares) | shares 26,540,716 26,393,359 26,291,641 25,684,475 26,272,487 26,211,524 26,246,868 25,822,522 26,424,389 26,256,570 26,530,127
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 | $ / shares $ 0.97                    
Restructuring charges                      
Restructuring charges         $ 10,300       $ 2,963 $ 10,313  
Restructuring charges, after-tax         $ 6,300            
Impact of restructuring charges on earnings per share (in dollars per share) | $ / shares         (0.24)