CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUES	$ 771,490	$ 793,350	$ 1,483,329	$ 1,493,351
OPERATING EXPENSES	736,290	790,194	1,439,538	1,477,470
OPERATING INCOME	35,200	3,156	43,791	15,881
OTHER INCOME (COSTS)
Interest and dividend income	1,616	714	3,094	1,240
Interest and other related financing costs	(2,811)	(2,013)	(5,693)	(4,072)
Other, net	(445)	(1,123)	(1,036)	(3,324)
TOTAL OTHER INCOME (COSTS)	(1,640)	(2,422)	(3,635)	(6,156)
INCOME BEFORE INCOME TAXES	33,560	734	40,156	9,725
INCOME TAX PROVISION (BENEFIT)	9,184	(499)	10,892	(1,462)
NET INCOME	$ 24,376	$ 1,233	$ 29,264	$ 11,187
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.95	$ 0.05	$ 1.14	$ 0.43
Diluted (in dollars per share)	$ 0.92	$ 0.05	$ 1.10	$ 0.42
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	25,554,286	25,670,325	25,562,306	25,656,674
Diluted (in shares)	26,431,592	26,699,549	26,483,011	26,653,282
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.08	$ 0.08	$ 0.16	$ 0.16