CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUES	$ 826,158	$ 744,280	$ 2,319,509	$ 2,115,736
OPERATING EXPENSES	770,103	717,538	2,247,573	2,073,127
OPERATING INCOME	56,055	26,742	71,936	42,609
OTHER INCOME (COSTS)
Interest and dividend income	1,120	346	2,360	905
Interest and other related financing costs	(2,470)	(1,706)	(6,542)	(4,410)
Other, net	(714)	(1,314)	(4,038)	(3,548)
TOTAL OTHER INCOME (COSTS)	(2,064)	(2,674)	(8,220)	(7,053)
INCOME BEFORE INCOME TAXES	53,991	24,068	63,716	35,556
INCOME TAX PROVISION	13,215	9,280	11,753	12,398
NET INCOME	$ 40,776	$ 14,788	$ 51,963	$ 23,158
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 1.58	$ 0.57	$ 2.02	$ 0.90
Diluted (in dollars per share)	$ 1.52	$ 0.56	$ 1.94	$ 0.87
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	25,697,509	25,671,535	25,670,435	25,699,306
Diluted (in shares)	26,795,659	26,393,359	26,708,259	26,373,382
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.08	$ 0.08	$ 0.24	$ 0.24