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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS                      
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)                      
Interest and dividend income                 1,293 1,523 1,284
Interest and other related financing costs                 (6,342) (5,150) (4,400)
Other, net                 3,115 2,944 354
TOTAL OTHER INCOME (COSTS) (660) (281) (599) (394) (115) 185 (273) (480) (1,934) (683) (2,762)
INCOME BEFORE INCOME TAXES                 51,576 28,287 72,734
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 PER COMMON SHARE                      
Basic (in dollars per share) $ 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) $ 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) 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) 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
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.32 $ 0.32 $ 0.26