CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUES	$ 948,973	$ 627,370	$ 1,778,186	$ 1,328,769
OPERATING EXPENSES	874,674	606,945	1,671,696	1,300,525
OPERATING INCOME	74,299	20,425	106,490	28,244
OTHER INCOME (COSTS)
Interest and dividend income	322	991	714	2,366
Interest and other related financing costs	(2,274)	(3,378)	(4,702)	(6,325)
Other, net	1,111	2,696	2,303	(1,166)
TOTAL OTHER INCOME (COSTS)	(841)	309	(1,685)	(5,125)
INCOME BEFORE INCOME TAXES	73,458	20,734	104,805	23,119
INCOME TAX PROVISION	12,477	4,854	20,463	5,337
NET INCOME	$ 60,981	$ 15,880	$ 84,342	$ 17,782
EARNINGS PER COMMON SHARE
Basic	$ 2.38	$ 0.62	$ 3.30	$ 0.70
Diluted	$ 2.27	$ 0.61	$ 3.13	$ 0.68
AVERAGE COMMON SHARES OUTSTANDING
Basic	25,586,353	25,463,559	25,522,453	25,468,624
Diluted	26,910,796	26,217,957	26,926,133	26,252,486
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.08	$ 0.08	$ 0.16	$ 0.16