Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUES	$ 459,957	$ 408,474	$ 1,345,252	$ 1,223,390
EXPENSES:
Operating	326,500	282,712	945,197	857,702
General and administrative	26,791	27,635	76,770	79,586
Depreciation and amortization	41,230	28,277	108,315	85,413
Asset impairments			955	2,238
Costs and Expenses, Total	394,521	338,624	1,131,237	1,024,939
OPERATING INCOME	65,436	69,850	214,015	198,451
OTHER (INCOME) EXPENSE:
Interest expense, net	11,764	10,376	33,715	29,088
Expenses associated with debt refinancing transactions	701		701
Other (income) expense	(363)	(143)	(353)	(1,143)
Total non-operating expense (income)	12,102	10,233	34,063	27,945
INCOME BEFORE INCOME TAXES	53,334	59,617	179,952	170,506
Income tax expense	(2,658)	(2,071)	(6,696)	(5,490)
NET INCOME	$ 50,676	$ 57,546	$ 173,256	$ 165,016
BASIC EARNINGS PER SHARE	$ 0.43	$ 0.50	$ 1.48	$ 1.42
DILUTED EARNINGS PER SHARE	0.43	0.49	1.47	1.41
Dividend declared on common stock, per share	$ 0.54	$ 0.51	$ 1.62	$ 1.53