CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net (loss) income	$ (51,915)	$ 493,665	$ 548,675
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Interest rate swap settlement deferred in comprehensive income	(50,982)	20,018	0
Depreciation and amortization	269,423	269,243	254,659
Amortization of debt issuance costs, discounts, and settled interest rate swaps	15,587	17,202	16,926
Non-cash unit-based compensation expense	21,890	30,568	33,482
Gain on sale of DPTS asset package	(342,984)	0	0
Changes in fair value of derivatives, net	(19,932)	(24,730)	103,336
Amortization of acquired storage contracts	0	0	(5,979)
Loss (earnings) from equity investments	274,123	(36,005)	(11,536)
Distributions of earnings from equity investments	24,350	35,854	3,280
Goodwill impairment	536,964	0	0
(Gain) loss on other asset retirements and disposals, net	(15,886)	(5,406)	(5,187)
Other non-cash items	4,608	3,632	7,162
Change in assets and liabilities, net of amounts related to acquisitions:
Accounts receivable, net	54,586	(28,957)	(23,646)
Construction and pipeline relocation receivables	(3,212)	6,229	(4,961)
Inventories	92,095	56,430	(162,257)
Prepaid and other current assets	(22,279)	23,278	(41,224)
Accounts payable	(25,350)	46,078	25,983
Accrued and other current liabilities	44	(4,278)	(7,347)
Other non-current assets and liabilities	6,699	(14,419)	(13,449)
Net cash provided by operating activities	767,829	888,402	717,917
Cash flows from investing activities:
Capital expenditures	(467,611)	(433,335)	(486,316)
Proceeds from sale of DPTS asset package	444,555	0	0
Proceeds from property disposals and recoveries	9,388	6,409	8,263
Acquisition of and contribution to equity investments	(42,204)	(1,387,844)	0
Distributions from equity investments in excess of earnings	76,413	31,724	2,526
Acquisitions of business, net of cash acquired	896	(26,942)	(26,025)
Proceeds from settlement of interest rate swap	50,982	0	0
Escrow returns (deposits)	0	0	19,850
Net cash provided by (used in) investing activities	72,419	(1,809,988)	(481,702)
Cash flows from financing activities:
Net proceeds from issuance of Units and exercise of Unit options	261,962	346,276	689,428
Payment of tax withholding on issuance of LTIP awards	(8,306)	(9,447)	(6,711)
Proceeds from issuance of long-term debt, net of issuance costs	394,937	394,418	841,451
Repayment of long-term debt	(700,000)	(125,000)	0
Borrowings under the BPL Credit Facility	2,391,700	1,912,872	1,007,200
Repayments under the BPL Credit Facility	(2,213,799)	(1,746,172)	(1,368,200)
Net (repayments) borrowings under the BMSC Credit Facility	(74,477)	252,204	(111,488)
Acquisition of remaining noncontrolling interest	(210,000)	0	0
Contributions from noncontrolling interests	7,400	12,000	5,000
Distributions paid to noncontrolling interests	(16,292)	(39,230)	(15,750)
Distributions to LP unitholders	(673,723)	(714,495)	(641,686)
Net cash (used in) provided by financing activities	(840,598)	283,426	399,244
Net (decrease) increase in cash and cash equivalents	(350)	(638,160)	635,459
Cash and cash equivalents — Beginning of year	2,180	640,340	4,881
Cash and cash equivalents — End of year	$ 1,830	$ 2,180	$ 640,340