Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES	$ 474,935	$ 459,957	$ 1,385,651	$ 1,345,252
EXPENSES:
Operating	326,349	326,500	956,713	945,197
General and administrative	27,699	26,791	81,543	76,770
Depreciation and amortization	42,924	41,230	127,328	108,315
Restructuring charges	4,010		4,010
Asset impairments				955
Costs and Expenses, Total	400,982	394,521	1,169,594	1,131,237
OPERATING INCOME	73,953	65,436	216,057	214,015
OTHER (INCOME) EXPENSE:
Interest expense, net	16,937	11,764	51,277	33,715
Expenses associated with debt refinancing transactions		701		701
Other (income) expense	54	(363)	103	(353)
Total non-operating expense (income)	16,991	12,102	51,380	34,063
INCOME BEFORE INCOME TAXES	56,962	53,334	164,677	179,952
Income tax expense	(1,622)	(2,658)	(5,447)	(6,696)
NET INCOME	$ 55,340	$ 50,676	$ 159,230	$ 173,256
BASIC EARNINGS PER SHARE	$ 0.47	$ 0.43	$ 1.36	$ 1.48
DILUTED EARNINGS PER SHARE	0.47	0.43	1.35	1.47
DIVIDENDS DECLARED PER SHARE	$ 0.54	$ 0.54	$ 1.62	$ 1.62