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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS        
REVENUES $ 709,380 $ 711,295 $ 2,018,771 $ 1,947,845
OPERATING EXPENSES 675,942 678,354 1,950,588 1,896,655
OPERATING INCOME 33,438 32,941 68,183 51,190
OTHER INCOME (COSTS)        
Interest and dividend income 378 215 882 600
Interest and other related financing costs (1,157) (834) (3,183) (2,367)
Other, net (613) 234 (15) 1,549
TOTAL OTHER INCOME (COSTS) (1,392) (385) (2,316) (218)
INCOME BEFORE INCOME TAXES 32,046 32,556 65,867 50,972
INCOME TAX PROVISION 12,892 12,938 26,001 19,339
NET INCOME $ 19,154 $ 19,618 $ 39,866 $ 31,633
EARNINGS PER COMMON SHARE        
Basic (in dollars per share) $ 0.73 $ 0.72 $ 1.52 $ 1.16
Diluted (in dollars per share) $ 0.72 $ 0.72 $ 1.48 $ 1.16
AVERAGE COMMON SHARES OUTSTANDING        
Basic (in shares) 26,009,344 26,054,678 26,033,467 25,979,555
Diluted (in shares) 26,508,482 26,054,678 26,569,800 25,980,008
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 0.06 $ 0.03 $ 0.18 $ 0.09