Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities
Net Income and Comprehensive Income	$ 34,520	$ 13,510
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and Amortization	2,449	2,144
Deferred Income Taxes	0	3,993
Other Adjustments for Noncash Items Included in Income	222	75
Changes in Operating Assets and Liabilities
Increase in Accounts Receivable — Affiliate	(3,322)	(9,803)
Increase in Current Income Taxes Payable	0	4,153
(Decrease) Increase in Accounts Payable	(2,518)	464
Other Operating Assets and Liabilities, Net	874	63
Net Cash Provided by Operating Activities	32,225	14,599
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(32,298)	(11,906)
Additions to Investments	(414)	(35)
Distributions from Investments	123	280
Net Cash Used in Investing Activities	(32,589)	(11,661)
Cash Flows From Financing Activities
Distributions to Parent	0	(21,480)
Contributions from Parent	0	223
Distributions to Noncontrolling Interests	(11,267)	0
Cash Contributions from Noncontrolling Interests	7,087	0
Distributions to Unitholders	(13,782)	0
Repayment of Capital Lease Obligation	(236)	0
Net Cash Used in Financing Activities	(18,198)	(21,257)
Decrease in Cash and Cash Equivalents	(18,562)	(18,319)
Cash and Cash Equivalents at Beginning of Period	57,421	26,612
Cash and Cash Equivalents at End of Period	$ 38,859	$ 8,293