CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUES	$ 793,350	$ 720,368	$ 1,493,351	$ 1,371,456
OPERATING EXPENSES	790,194	694,601	1,477,470	1,355,589
OPERATING INCOME	3,156	25,767	15,881	15,867
OTHER INCOME (COSTS)
Interest and dividend income	714	285	1,240	559
Interest and other related financing costs	(2,013)	(1,389)	(4,072)	(2,704)
Other, net	(1,123)	(528)	(3,324)	(2,234)
TOTAL OTHER INCOME (COSTS)	(2,422)	(1,632)	(6,156)	(4,379)
INCOME BEFORE INCOME TAXES	734	24,135	9,725	11,488
INCOME TAX PROVISION (BENEFIT)	(499)	8,358	(1,462)	3,118
NET INCOME	$ 1,233	$ 15,777	$ 11,187	$ 8,370
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.05	$ 0.61	$ 0.43	$ 0.32
Diluted (in dollars per share)	$ 0.05	$ 0.60	$ 0.42	$ 0.32
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	25,670,325	25,767,791	25,656,674	25,726,363
Diluted (in shares)	26,699,549	26,291,641	26,653,282	26,378,436
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.08	$ 0.08	$ 0.16	$ 0.16