Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
REVENUES	$ 484,064	$ 440,916
EXPENSES:
Operating	345,832	319,151
General and administrative	29,445	24,971
Depreciation and amortization	35,523	38,089
Costs and Expenses, Total	410,800	382,211
OPERATING INCOME	73,264	58,705
OTHER (INCOME) EXPENSE:
Interest expense, net	21,436	19,036
Other (income) expense	4	(43)
Total non-operating expense (income)	21,440	18,993
INCOME BEFORE INCOME TAXES	51,824	39,712
Income tax expense	(2,484)	(1,935)
NET INCOME	$ 49,340	$ 37,777
BASIC EARNINGS PER SHARE	$ 0.42	$ 0.32
DILUTED EARNINGS PER SHARE	$ 0.41	$ 0.32