CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUES	$ 627,370	$ 771,490	$ 1,328,769	$ 1,483,329
OPERATING EXPENSES	606,945	736,290	1,300,525	1,439,538
OPERATING INCOME	20,425	35,200	28,244	43,791
OTHER INCOME (COSTS)
Interest and dividend income	991	1,616	2,366	3,094
Interest and other related financing costs	(3,378)	(2,811)	(6,325)	(5,693)
Other, net	2,696	(445)	(1,166)	(1,036)
TOTAL OTHER INCOME (COSTS)	309	(1,640)	(5,125)	(3,635)
INCOME BEFORE INCOME TAXES	20,734	33,560	23,119	40,156
INCOME TAX PROVISION	4,854	9,184	5,337	10,892
NET INCOME	$ 15,880	$ 24,376	$ 17,782	$ 29,264
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.62	$ 0.95	$ 0.70	$ 1.14
Diluted (in dollars per share)	$ 0.61	$ 0.92	$ 0.68	$ 1.10
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	25,463,559	25,554,286	25,468,624	25,562,306
Diluted (in shares)	26,217,957	26,431,592	26,252,486	26,483,011
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.08	$ 0.08	$ 0.16	$ 0.16