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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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 shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | 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) |  |  |  |  |  |

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