Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 59,117	$ 49,508
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	36,205	37,436
Deferred compensation	204
Gain on derivatives, net		(1,467)
Amortization of deferred financing costs	1,030	1,167
Changes in assets and liabilities:
Accounts receivable, net	5,258	6,887
Prepaid expenses and other assets	(230)	223
Accounts payable, accrued expenses and other current liabilities	(1,062)	7,903
Accounts payable - affiliates	(9,759)	(18,770)
Deferred revenue - current	(166)	(654)
Deferred revenue - non-current	(49)	(49)
Other non-current liabilities	(685)
Net cash flows provided by operating activities	89,863	82,184
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(36,554)	(44,889)
Change in accrued property, plant and equipment	187	1,018
Proceeds from sale of assets	65	743
Net cash flows used in investing activities	(36,302)	(43,128)
CASH FLOWS FROM FINANCING ACTIVITIES:
New borrowings of bank debt		31,000
Repayment of bank debt	(5,125)	(68,250)
Dividend payments on preferred members' interest (Note 7)	(4,500)	(4,500)
Capital contributions from parent (Note 8)	110,950	158,000
Capital distributions to parent (Note 8)	(49,800)	(500)
Other financing activities	(1,164)	3,558
Net cash flows provided by financing activities	50,361	119,308
Net change in cash	103,922	158,364
CASH, beginning of period	29,964	12,606
CASH, end of period	$ 133,886	$ 170,970