Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
REVENUES	$ 445,684	$ 447,385
EXPENSES:
Operating	315,303	313,918
General and administrative	24,826	26,480
Depreciation and amortization	36,257	42,059
Asset impairments	259
Costs and Expenses, Total	376,645	382,457
OPERATING INCOME	69,039	64,928
OTHER (INCOME) EXPENSE:
Interest expense, net	16,490	17,544
Other (income) expense	17	(83)
Total non-operating expense (income)	16,507	17,461
INCOME BEFORE INCOME TAXES	52,532	47,467
Income tax expense	(2,485)	(1,160)
NET INCOME	$ 50,047	$ 46,307
BASIC EARNINGS PER SHARE	$ 0.42	$ 0.39
DILUTED EARNINGS PER SHARE	0.42	0.39
DIVIDENDS DECLARED PER SHARE	$ 0.42	$ 0.54