Magellan Midstream Partners (MMP) 10-Q 1 May 19 2019 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Registrant Name	MAGELLAN MIDSTREAM PARTNERS LP
Entity Central Index Key	0001126975
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		228,403,428
Entity Emerging Growth Company	false
Entity Small Business	false

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 628,935	$ 678,779
Costs and expenses:
Operating	146,025	143,296
Cost of product sales	169,094	199,592
Depreciation, amortization and impairment	61,871	51,879
General and administrative	45,995	46,556
Total costs and expenses	422,985	441,323
Other income	6,941	0
Earnings of non-controlled entities	31,255	34,538
Operating profit	244,146	271,994
Interest expense	60,166	56,652
Interest capitalized	(3,454)	(4,647)
Interest income	(1,660)	(579)
Gain on disposition of assets	(21,788)	0
Other expense	2,050	8,724
Income before provision for income taxes	208,832	211,844
Provision for income taxes	1,169	934
Net income	$ 207,663	$ 210,910
Basic net income per limited partner unit (in dollars per share)	$ 0.91	$ 0.92
Diluted net income per limited partner unit (in dollars per share)	$ 0.91	$ 0.92
Weighted average number of limited partner units outstanding used for basic net income per unit calculation (in dollars per share)	228,558	228,320
Weighted average number of limited partner units outstanding used for diluted net income per unit calculation (in dollars per share)	228,558	228,360
Service [Member]
Revenues	$ 460,792	$ 431,937
Product [Member]
Revenues	162,995	241,592
Product and Service, Other [Member]
Revenues	$ 5,148	$ 5,250

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 207,663	$ 210,910
Other comprehensive income (loss):
Net gain (loss) on cash flow hedges	(4,376)	5,414
Reclassification of net loss on cash flow hedges to income	627	740
Net actuarial loss	0	(5,944)
Amortization of prior service credit	(45)	(45)
Amortization of actuarial loss	1,348	5,114
Total other comprehensive income (loss)	(2,446)	5,279
Comprehensive income	$ 205,217	$ 216,189

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 13,496	$ 218,283
Trade accounts receivable	134,120	104,164
Other accounts receivable	31,937	25,007
Inventory	195,048	185,735
Energy commodity derivatives contracts, net	0	55,011
Energy commodity derivatives deposits	23,820	0
Other current assets	39,767	58,143
Total current assets	438,188	646,343
Property, plant and equipment	7,808,952	7,628,592
Less: accumulated depreciation	1,883,358	1,830,411
Net property, plant and equipment	5,925,594	5,798,181
Investments in non-controlled entities	1,128,626	1,076,306
Right-of-use asset, operating leases	172,105	0
Long-term receivables	20,646	20,844
Goodwill	53,260	53,260
Other intangibles (less accumulated amortization of $2,979 and $4,253 at December 31, 2018 and March 31, 2019, respectively)	49,900	51,174
Restricted cash	37,033	90,978
Other noncurrent assets	19,199	10,451
Total assets	7,844,551	7,747,537
Current liabilities:
Accounts payable	192,969	138,735
Accrued payroll and benefits	31,211	70,276
Accrued interest payable	46,788	63,258
Accrued taxes other than income	41,073	53,093
Environmental liabilities	6,851	9,153
Deferred revenue	118,690	121,085
Accrued product liabilities	94,431	75,482
Energy commodity derivatives contracts, net	13,272	0
Energy commodity derivatives deposits	0	37,328
Current portion of operating lease liability	23,264	0
Current portion of long-term debt, net	0	59,489
Other current liabilities	54,819	48,657
Total current liabilities	623,368	676,556
Long-term operating lease liability	148,603	0
Long-term debt, net	4,279,676	4,211,380
Long-term pension and benefits	124,652	122,580
Other noncurrent liabilities	40,295	82,240
Environmental liabilities	11,702	11,347
Commitments and contingencies
Partners’ capital:
Limited partner unitholders (228,195 units and 228,403 units outstanding at December 31, 2018 and March 31, 2019, respectively)	2,739,192	2,763,925
Accumulated other comprehensive loss	(122,937)	(120,491)
Total partners’ capital	2,616,255	2,643,434
Total liabilities and partners’ capital	$ 7,844,551	$ 7,747,537

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Other intangibles, accumulated amortization	$ 4,253	$ 2,979
Limited partner unitholders, units outstanding (in shares)	228,403,428	228,195,160

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 207,663	$ 210,910
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairment expense	61,871	51,879
Loss (gain) on sale and retirement of assets	(21,759)	1,997
Earnings of non-controlled entities	(31,255)	(34,538)
Distributions from operations of non-controlled entities	43,069	51,754
Equity-based incentive compensation expense	4,914	6,632
Amortization of prior service credit and actuarial loss	1,303	5,069
Debt prepayment penalty	8,270	0
Changes in operating assets and liabilities:
Trade accounts receivable and other accounts receivable	(36,886)	23,371
Inventory	(9,313)	(13,642)
Energy commodity derivatives contracts, net of derivatives deposits	7,135	617
Accounts payable	2,909	19,457
Accrued payroll and benefits	(39,065)	(26,544)
Accrued interest payable	(16,470)	(17,956)
Accrued taxes other than income	(12,020)	(16,721)
Accrued product liabilities	18,949	(10,893)
Deferred revenue	(2,395)	1,463
Current and noncurrent environmental liabilities	(1,947)	(359)
Other current and noncurrent assets and liabilities	21,583	25,406
Net cash provided by operating activities	206,556	277,902
Investing Activities:
Additions to property, plant and equipment, net	(206,436)	(99,471)
Proceeds from sale and disposition of assets	53,676	214
Investments in non-controlled entities	(76,634)	(60,976)
Distributions from returns of investments in non-controlled entities	7,500	0
Net cash used by investing activities	(221,894)	(160,233)
Financing Activities:
Distributions paid	(227,832)	(209,940)
Net commercial paper borrowings	69,000	0
Borrowings under long-term notes	496,855	0
Payments on notes	(550,000)	0
Debt placement costs	(5,355)	(315)
Net payment on financial derivatives	(8,028)	0
Payments associated with settlement of equity-based incentive compensation	(9,764)	(9,285)
Debt prepayment penalty	(8,270)	0
Net cash used by financing activities	(243,394)	(219,540)
Change in cash, cash equivalents and restricted cash	(258,732)	(101,871)
Cash, cash equivalents and restricted cash at beginning of period	309,261	176,068
Cash, cash equivalents and restricted cash at end of period	50,529	74,197
Supplemental non-cash investing and financing activities:
Issuance of limited partner units in settlement of equity-based incentive plan awards	480	120
Additions to property, plant and equipment	(260,734)	(105,384)
Changes in accounts payable and other current liabilities related to capital expenditures	54,298	5,913
Additions to property, plant and equipment, net	$ (206,436)	$ (99,471)

Consolidated Statement of Partn

Consolidated Statement of Partners' Capital Statement - USD ($) $ in Thousands	Total	Limited Partners	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2017	$ 2,129,653	$ 2,267,231	$ (137,578)
Comprehensive income:
Net income	210,910	210,910
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5,279		5,279
Comprehensive income	216,189	210,910	5,279
Distributions	(209,940)	(209,940)
Equity-based incentive compensation expense	6,632	6,632
Issuance of limited partner units in settlement of equity-based incentive plan awards	120	120
Payments associated with settlement of equity-based incentive compensation	(9,285)	(9,285)
Other	(157)	(157)
Ending balance at Mar. 31, 2018	2,139,187	2,271,486	(132,299)
Beginning balance at Dec. 31, 2018	2,643,434	2,763,925	(120,491)
Comprehensive income:
Net income	207,663	207,663
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(2,446)		(2,446)
Comprehensive income	205,217	207,663	(2,446)
Distributions	(227,832)	(227,832)
Equity-based incentive compensation expense	4,914	4,914
Issuance of limited partner units in settlement of equity-based incentive plan awards	480	480
Payments associated with settlement of equity-based incentive compensation	(9,764)	(9,764)
Other	(194)	(194)
Ending balance at Mar. 31, 2019	$ 2,616,255	$ 2,739,192	$ (122,937)

Organization, Description of Bu

Organization, Description of Business And Basis Of Presentation	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Description of Business and Basis of Presentation	Organization, Description of Business and Basis of Presentation Organization Unless indicated otherwise, the terms “our,” “we,” “us” and similar language refer to Magellan Midstream Partners, L.P. together with its subsidiaries. Magellan Midstream Partners, L.P. is a Delaware limited partnership, and its limited partner units are traded on the New York Stock Exchange under the ticker symbol “MMP.” Magellan GP, LLC, a wholly-owned Delaware limited liability company, serves as its general partner. Description of Business We are principally engaged in the transportation, storage and distribution of refined petroleum products and crude oil. As of March 31, 2019 , our asset portfolio consisted of: • our refined products segment, comprised of our approximately 9,700 -mile refined products pipeline system with 53 terminals as well as 25 independent terminals not connected to our pipeline system and our 1,100 -mile ammonia pipeline system; • our crude oil segment, comprised of approximately 2,200 miles of crude oil pipelines, a condensate splitter and 33 million barrels of aggregate storage capacity, of which approximately 21 million barrels are used for contract storage. Approximately 1,000 miles of these pipelines, the condensate splitter and 28 million barrels of this storage capacity (including 19 million barrels used for contract storage) are wholly-owned, and the remainder is owned through joint ventures; and • our marine storage segment, consisting of six marine terminals located along coastal waterways with an aggregate storage capacity of approximately 27 million barrels. Five of these terminals and approximately 25 million barrels of this storage capacity are wholly-owned, and the remainder is owned through joint ventures. Terminology common in our industry includes the following terms, which describe products that we transport, store and distribute through our pipelines and terminals: • refined products are the output from refineries and are primarily used as fuels by consumers. Refined products include gasoline, diesel fuel, aviation fuel, kerosene and heating oil. Collectively, diesel fuel, kerosene and heating oil are referred to as distillates; • liquefied petroleum gases, or LPGs, are produced as by-products of the crude oil refining process and in connection with natural gas production. LPGs include butane and propane; • blendstocks are blended with refined products to change or enhance their characteristics such as increasing a gasoline’s octane or oxygen content. Blendstocks include alkylates, oxygenates and natural gasoline; • heavy oils and feedstocks are used as burner fuels or feedstocks for further processing by refineries and petrochemical facilities. Heavy oils and feedstocks include No. 6 fuel oil and vacuum gas oil; • crude oil , which includes condensate, is used as feedstock by refineries, splitters and petrochemical facilities; and • biofuels , such as ethanol and biodiesel, are typically blended with other refined products as required by government mandates. We use the term petroleum products to describe any, or a combination, of the above-noted products. Basis of Presentation In the opinion of management, our accompanying consolidated financial statements which are unaudited, except for the consolidated balance sheet as of December 31, 2018 , which is derived from our audited financial statements, include all normal and recurring adjustments necessary to present fairly our financial position as of March 31, 2019 , the results of operations for the three months ended March 31, 2018 and 2019 and cash flows for the three months ended March 31, 2018 and 2019 . The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the full year ending December 31, 2019 for several reasons. Profits from our butane blending activities are realized largely during the first and fourth quarters of each year. Additionally, gasoline demand, which drives transportation volumes and revenues on our refined products pipeline system, generally trends higher during the summer driving months. Further, the volatility of commodity prices impacts the profits from our commodity activities and, to a lesser extent, the volume of petroleum products we transport on our pipelines. Pursuant to the rules and regulations of the Securities and Exchange Commission, the financial statements in this report do not include all of the information and notes normally included with financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018 . Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities that exist at the date of our consolidated financial statements, as well as their impact on the reported amounts of revenue and expense during the reporting periods. Actual results could differ from those estimates. New Accounting Pronouncements - Adopted by us on January 1, 2019 In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842). This ASU requires lessees to recognize a right of use asset and lease liability on the balance sheet for all leases, with the exception of short-term leases. The new accounting model for lessors remains largely the same, although some changes have been made to align it with the new lessee model and the new revenue recognition guidance. This update also requires companies to include additional disclosures regarding their lessee and lessor agreements. We adopted this standard on January 1, 2019, and it did not have a material impact on our consolidated statements of income or our leverage ratio as defined in our credit agreement. Adoption of this ASU resulted in an increase in our assets and liabilities by approximately $172 million due to the recognition of right of use assets and lease liabilities. See Note 7 – Leases for our lease disclosures.

Revenue from Contract with Cust

Revenue from Contract with Customers	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Revenue from Contracts with Customers Statement of Income Disclosures The following tables provide details of our revenues disaggregated by key activities that comprise our performance obligations by operating segment (in thousands): Three Months Ended March 31, 2018 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation $ 166,902 $ 79,123 $ — $ — $ 246,025 Terminalling 39,348 — 712 — 40,060 Storage 25,247 29,990 34,211 (915 ) 88,533 Ancillary services 25,788 5,035 7,034 — 37,857 Lease revenue 3,109 12,110 4,243 — 19,462 Transportation and terminals revenue 260,394 126,258 46,200 (915 ) 431,937 Product sales revenue 232,774 6,439 2,379 — 241,592 Affiliate management fee revenue 297 4,016 937 — 5,250 Total revenue 493,465 136,713 49,516 (915 ) 678,779 Revenue not under the guidance of ASC 606: Lease revenue (1) (3,109 ) (12,110 ) (4,243 ) — (19,462 ) Losses from futures contracts included in product sales revenue (2) 5,465 1,910 — — 7,375 Affiliate management fee revenue (297 ) (4,016 ) (937 ) — (5,250 ) Total revenue from contracts with customers under ASC 606 $ 495,524 $ 122,497 $ 44,336 $ (915 ) $ 661,442 (1) Lease revenue in 2018 is accounted for under ASC 840, Leases . (2) The impact on product sales revenue from futures contracts falls under the guidance of ASC 815, Derivatives and Hedging . Three Months Ended March 31, 2019 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation $ 171,027 $ 85,158 $ — $ — $ 256,185 Terminalling 40,398 5,246 899 — 46,543 Storage 26,439 34,318 35,218 (938 ) 95,037 Ancillary services 25,896 6,021 6,885 — 38,802 Lease revenue 3,245 16,865 4,115 — 24,225 Transportation and terminals revenue 267,005 147,608 47,117 (938 ) 460,792 Product sales revenue 155,156 5,713 2,126 — 162,995 Affiliate management fee revenue 412 3,486 1,250 — 5,148 Total revenue 422,573 156,807 50,493 (938 ) 628,935 Revenue not under the guidance of ASC 606: Lease revenue (1) (3,245 ) (16,865 ) (4,115 ) — (24,225 ) Losses from futures contracts included in product sales revenue (2) 52,109 2,402 — — 54,511 Affiliate management fee revenue (412 ) (3,486 ) (1,250 ) — (5,148 ) Total revenue from contracts with customers under ASC 606 $ 471,025 $ 138,858 $ 45,128 $ (938 ) $ 654,073 (1) Lease revenue in 2019 is accounted for under ASC 842, Leases . (2) The impact on product sales revenue from futures contracts falls under the guidance of ASC 815, Derivatives and Hedging . Balance Sheet Disclosures The following table summarizes our accounts receivable, contract assets and contract liabilities resulting from contracts with customers (in thousands): December 31, 2018 March 31, 2019 Accounts receivable from contracts with customers $ 102,684 $ 130,257 Contract assets $ 8,487 $ 8,618 Contract liabilities $ 122,129 $ 124,439 For the three months ended March 31, 2019 , we recognized $70.2 million of transportation and terminals revenue that was recorded in deferred revenue as of December 31, 2018. Unfulfilled Performance Obligations The following table provides the aggregate amount of the transaction price allocated to our unfulfilled performance obligations (“UPOs”) as of March 31, 2019 by operating segment, including the range of years remaining on our contracts with customers and an estimate of revenues expected to be recognized over the next 12 months (dollars in thousands): Refined Products Crude Oil Marine Storage Total Balances at 3/31/2019 $ 2,082,007 $ 1,270,411 $ 239,820 $ 3,592,238 Remaining terms 1 - 19 years 1 - 10 years 1 - 5 years Estimated revenues from UPOs to be recognized in the next 12 months $ 289,218 $ 327,365 $ 115,727 $ 732,310

Segment Disclosures

Segment Disclosures	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Disclosures	Segment Disclosures Our reportable segments are strategic business units that offer different products and services. Our segments are managed separately as each segment requires different marketing strategies and business knowledge. Management evaluates performance based on segment operating margin, which includes revenue from affiliates and external customers, operating expenses, cost of product sales and earnings of non-controlled entities. We believe that investors benefit from having access to the same financial measures used by management. Operating margin, which is presented in the following tables, is an important measure used by management to evaluate the economic performance of our core operations. Operating margin is not a GAAP measure, but the components of operating margin are computed using amounts that are determined in accordance with GAAP. A reconciliation of operating margin to operating profit, which is its nearest comparable GAAP financial measure, is included in the tables below (presented in thousands). Operating profit includes depreciation, amortization and impairment expense and general and administrative (“G&A”) expense that management does not consider when evaluating the core profitability of our separate operating segments. Three Months Ended March 31, 2018 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation and terminals revenue $ 260,394 $ 126,258 $ 46,200 $ (915 ) $ 431,937 Product sales revenue 232,774 6,439 2,379 — 241,592 Affiliate management fee revenue 297 4,016 937 — 5,250 Total revenue 493,465 136,713 49,516 (915 ) 678,779 Operating expenses 94,049 33,591 17,964 (2,308 ) 143,296 Cost of product sales 190,333 7,050 2,209 — 199,592 Earnings of non-controlled entities (2,318 ) (31,608 ) (612 ) — (34,538 ) Operating margin 211,401 127,680 29,955 1,393 370,429 Depreciation, amortization and impairment expense 28,907 12,762 8,817 1,393 51,879 G&A expense 28,887 11,906 5,763 — 46,556 Operating profit $ 153,607 $ 103,012 $ 15,375 $ — $ 271,994 Three Months Ended March 31, 2019 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation and terminals revenue $ 267,005 $ 147,608 $ 47,117 $ (938 ) $ 460,792 Product sales revenue 155,156 5,713 2,126 — 162,995 Affiliate management fee revenue 412 3,486 1,250 — 5,148 Total revenue 422,573 156,807 50,493 (938 ) 628,935 Operating expenses 89,678 43,823 14,897 (2,373 ) 146,025 Cost of product sales 160,154 6,664 2,276 — 169,094 Other income (614 ) (1,573 ) (4,754 ) — (6,941 ) (Earnings) losses of non-controlled entities 1,430 (32,302 ) (383 ) — (31,255 ) Operating margin 171,925 140,195 38,457 1,435 352,012 Depreciation, amortization and impairment expense 35,534 15,259 9,643 1,435 61,871 G&A expense 27,715 12,615 5,665 — 45,995 Operating profit $ 108,676 $ 112,321 $ 23,149 $ — $ 244,146

Investments in Non-Controlled E

Investments in Non-Controlled Entities	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments in Non-Controlled Entities	Investments in Non-Controlled Entities Our investments in non-controlled entities at March 31, 2019 were comprised of: Entity Ownership Interest BridgeTex Pipeline Company, LLC (“BridgeTex”) 30% Double Eagle Pipeline LLC (“Double Eagle”) 50% HoustonLink Pipeline Company, LLC (“HoustonLink”) 50% MVP Terminalling, LLC (“MVP”) 50% Powder Springs Logistics, LLC (“Powder Springs”) 50% Saddlehorn Pipeline Company, LLC (“Saddlehorn”) 40% Seabrook Logistics, LLC (“Seabrook”) 50% Texas Frontera, LLC (“Texas Frontera”) 50% We serve as operator of BridgeTex, HoustonLink, MVP, Powder Springs, Saddlehorn, Texas Frontera and the pipeline activities of Seabrook. We receive fees for management services as well as reimbursement or payment to us for certain direct operational payroll and other overhead costs. The management fees we have received are reported as affiliate management fee revenue on our consolidated statements of income. Cost reimbursements we receive from these entities in connection with our operating services are included as reductions to costs and expenses on our consolidated statements of income and totaled $0.5 million and $1.5 million during the three months ended March 31, 2018 and 2019 , respectively. We recorded the following revenue and expense transactions from certain of these non-controlled entities in our consolidated statements of income (in thousands): Three Months Ended March 31, 2018 2019 Transportation and terminals revenue: BridgeTex, pipeline capacity and storage $ 9,864 $ 10,145 Double Eagle, throughput revenue $ 1,544 $ 1,659 Saddlehorn, storage revenue $ 538 $ 552 Operating costs: Seabrook, storage lease and ancillary services $ — $ 6,909 Product sales revenue: Powder Springs, butane sales $ 2,719 $ — Our consolidated balance sheets reflected the following balances related to our investments in non-controlled entities (in thousands): December 31, 2018 Trade Accounts Receivable Other Accounts Receivable Other Accounts Payable Long-Term Receivables BridgeTex $ 318 $ 1,549 $ — $ — Double Eagle $ 546 $ — $ — $ — MVP $ — $ 397 $ — $ — Powder Springs $ — $ — $ — $ 2,221 Saddlehorn $ — $ 183 $ — $ — Seabrook $ — $ — $ 1,140 $ — March 31, 2019 Trade Accounts Receivable Other Accounts Receivable Other Accounts Payable Long-Term Receivables BridgeTex $ 284 $ 779 $ 179 $ — Double Eagle $ 583 $ — $ — $ — MVP $ — $ 361 $ — $ — Powder Springs $ — $ 269 $ — $ 2,725 Saddlehorn $ — $ 109 $ — $ — Seabrook $ — $ — $ 1,646 $ — Texas Frontera $ — $ — $ 83 $ — The financial results from MVP and Texas Frontera are included in our marine storage segment, the financial results from BridgeTex, Double Eagle, HoustonLink, Saddlehorn and Seabrook are included in our crude oil segment and the financial results from Powder Springs are included in our refined products segment, each as earnings of non-controlled entities. A summary of our investments in non-controlled entities follows (in thousands): Investments at 12/31/2018 $ 1,076,306 Additional investment 76,634 Indemnification settlement (5,000 ) Earnings of non-controlled entities: Proportionate share of earnings 31,719 Amortization of excess investment and capitalized interest (464 ) Earnings of non-controlled entities 31,255 Less: Distributions from operations of non-controlled entities 43,069 Distributions from returns of investments in non-controlled entities 7,500 Investments at 3/31/2019 $ 1,128,626

Inventory

Inventory	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventory	Inventory Inventory at December 31, 2018 and March 31, 2019 was as follows (in thousands): December 31, 2018 March 31, Refined products $ 92,751 $ 80,437 Liquefied petroleum gases 46,612 52,725 Transmix 28,497 35,947 Crude oil 11,220 19,557 Additives 6,655 6,382 Total inventory $ 185,735 $ 195,048

Leases (Notes)

Leases (Notes)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Leases As of January 1, 2019, we adopted ASU 2016-02, Leases (Topic 842) using the modified retrospective method of adoption. We elected to use the transition option that allows us to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment (if any) to the opening balance of retained earnings in the year of adoption. Comparable periods continue to be presented under the guidance of the previous standard, ASC 840. ASC 842 requires lessees to recognize a lease liability and right-of-use asset on the balance sheet for operating leases. For lessors, the new accounting model remains largely the same, although some changes have been made to align it with the new lessee model and the new revenue recognition guidance, ASC 606, Revenue from Contracts with Customers . Our adoption of ASC 842 did not result in any material adjustments to retained earnings, changes in the timing or amounts of lease costs or changes to our leverage ratio as defined in our credit agreement. We have both lessee and lessor arrangements. Our leases are evaluated at inception or at any subsequent modification. Depending on the terms, leases are classified as either operating or finance leases if we are the lessee, or as operating, sales-type or direct financing leases if we are the lessor, as appropriate under ASC 842. Our lessee arrangements primarily include a terminalling and storage contract where we have exclusive use of dedicated tankage, leased pipelines and office buildings. Our lessor arrangements include pipeline capacity and storage contracts and our condensate splitter tolling agreement that qualify as operating leases under ASC 842. In addition, we have a long-term throughput and deficiency agreement with a customer that is being accounted for as a sales-type lease under ASC 842. In accordance with ASC 842, we have made an accounting policy election to not apply the new standard to lessee arrangements with a term of one year or less and no purchase option that is reasonably certain of exercise. We will continue to account for these short-term arrangements by recognizing payments and expenses as incurred, without recording a lease liability and right-of-use asset. We have also made an accounting policy election for both our lessee and lessor arrangements to combine lease and non-lease components. This election is applied to all of our lease arrangements as our non-lease components are not material and do not result in significant timing differences in the recognition of rental expenses or income. Operating Leases – Lessee We recognize a lease liability for each lease based on the present value of remaining minimum fixed rental payments (which includes payments under any renewal option that we are reasonably certain to exercise), using a discount rate that approximates the rate of interest we would have to pay to borrow on a collateralized basis over a similar term. We also recognize a right-of-use asset for each lease, valued at the lease liability, adjusted for prepaid or accrued rent balances existing at the time of initial recognition. The lease liability and right-of-use asset are reduced over the term of the lease as payments are made and the assets are used. Related Party Operating Lease. In third quarter 2018, we entered into a long-term terminalling and storage contract with our equity investee, Seabrook, where we have exclusive use of dedicated tankage that is utilized to provide our customers with crude oil storage capacity and dock access for crude oil imports and exports on the Texas Gulf Coast. This arrangement meets the definition of an operating lease, and our lease liability includes renewal options necessary to maintain control of the assets for a time period sufficient to meet our performance obligations to our third-party customers. Minimum fixed rental payments are recognized on a straight-line basis over the life of the lease as costs and expenses on our consolidated statements of income. Variable and short-term rental payments are recognized as costs and expenses as they are incurred. Variable payments consist of amounts that exceed the contractual minimum rental payment (for example, incremental payment increases tied to a change in a market index). Future minimum rental payments under operating leases with initial terms greater than one year as of March 31, 2019, are as follows (in thousands): Third Party Leases Seabrook Lease All Leases 2019 $ 15,889 $ 8,266 $ 24,155 2020 18,948 11,021 29,969 2021 18,994 9,368 28,362 2022 18,868 6,612 25,480 2023 18,419 6,612 25,031 Thereafter 29,867 37,471 67,338 Total future minimum rental payments 120,985 79,350 200,335 Present value discount 14,691 13,777 28,468 Total operating lease liability $ 106,294 $ 65,573 $ 171,867 The following table provides further information about our operating leases as of and for the three months ended March 31, 2019 (dollars in thousands): Third Party Leases Seabrook Lease All Leases Current lease liability $ 14,828 $ 8,436 $ 23,264 Long-term lease liability $ 91,466 $ 57,137 $ 148,603 Right-of-use asset $ 106,532 $ 65,573 $ 172,105 Fixed lease cost $ 4,821 $ 2,755 $ 7,576 Short-term lease cost 457 — 457 Variable lease cost 371 — 371 Total lease cost $ 5,649 $ 2,755 $ 8,404 Operating cash flows from operating leases $ 3,226 2,755 $ 5,981 Weighted average remaining lease term (years) 7 9 8 Weighted-average discount rate 4.1% 4.3% 4.2% Rent expense was $9.0 million for first quarter 2018 and was recognized in accordance with ASC 840. Operating Leases – Lessor We recognize fixed rental income on a straight-line basis over the life of the lease as revenue on our consolidated statements of income. Variable rental payments are recognized as revenue in the period in which the changes in facts and circumstances on which the variable lease payments are based occur. Future minimum payments receivable under operating leases with terms greater than one year as of March 31, 2019 are estimated as follows (in thousands): 2019 $ 30,892 2020 33,770 2021 33,583 2022 23,486 2023 7,699 Thereafter 16,019 Total $ 145,449 We recognized variable lease revenue of $13.7 million in first quarter 2019, primarily related to our condensate splitter in Corpus Christi, Texas. Property, plant and equipment utilized by our customers in operating lease arrangements consisted of: $229.6 million of processing equipment; $74.5 million of storage tanks; $44.3 million of pipeline and station equipment; and $27.9 million of other assets. The processing equipment primarily relates to our condensate splitter. Sales-Type Lease - Lessor We entered into a long-term throughput and deficiency agreement with a customer on a pipeline and related assets that we constructed in Texas and New Mexico, which contains minimum payment commitments. Our customer has the option to purchase this pipeline and related assets at the end of the lease term for a nominal amount. This agreement was previously accounted for as a direct-financing lease under ASC 840 and is now being accounted for as a sales-type lease under ASC 842. The net investment under this arrangement as of December 31, 2018 and March 31, 2019 was as follows (in thousands): December 31, 2018 March 31, 2019 Total minimum lease payments receivable $ 17,468 $ 17,031 Less: Unearned income 3,422 3,265 Recorded net investment in sales-type lease $ 14,046 $ 13,766 The net investment in sales-type leases was classified in the consolidated balance sheets as follows (in thousands): December 31, 2018 March 31, 2019 Other accounts receivable $ 1,138 $ 1,151 Long-term receivables 12,908 12,615 Total $ 14,046 $ 13,766 Future minimum payments receivable under this lease are $1.3 million in 2019, $1.7 million in 2020, $1.7 million in 2021, $1.7 million in 2022, $1.7 million in 2023 and $8.7 million thereafter.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We sponsor a defined contribution plan in which we match our employees’ qualifying contributions, resulting in additional expense to us. Expenses related to the defined contribution plan were $3.8 million and $4.1 million for the three months ended March 31, 2018 and 2019 , respectively. Additionally, we sponsor two union pension plans that cover certain union employees, a pension plan for all non-union employees and a postretirement benefit plan for certain employees. Net periodic benefit expense for the three months ended March 31, 2018 and 2019 was as follows (in thousands): Three Months Ended Three Months Ended March 31, 2018 March 31, 2019 Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Components of net periodic benefit costs: Service cost $ 15,700 $ 65 $ 6,527 $ 54 Interest cost 6,443 106 3,000 119 Expected return on plan assets (2,978 ) — (2,374 ) — Amortization of prior service credit (45 ) — (45 ) — Amortization of actuarial loss 4,954 160 1,277 71 Net periodic benefit cost $ 24,074 $ 331 $ 8,385 $ 244 The service component of our net periodic benefit costs is presented in operating expense and G&A expense, and the non-service components are presented in other expense in our consolidated statements of income. The changes in accumulated other comprehensive loss (“AOCL”) related to employee benefit plan assets and benefit obligations for the three months ended March 31, 2018 and 2019 were as follows (in thousands): Three Months Ended Three Months Ended March 31, 2018 March 31, 2019 Gains (Losses) Included in AOCL Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Beginning balance $ (97,226 ) $ (6,597 ) $ (88,602 ) $ (5,409 ) Net actuarial loss (5,944 ) — — — Amortization of prior service credit (45 ) — (45 ) — Amortization of actuarial loss 4,954 160 1,277 71 Ending balance $ (98,261 ) $ (6,437 ) $ (87,370 ) $ (5,338 ) Contributions estimated to be paid into the plans in 2019 are $32.1 million and $0.2 million for the pension plans and other postretirement benefit plan, respectively.

Debt

Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	Debt Long-term debt at December 31, 2018 and March 31, 2019 was as follows (in thousands): December 31, March 31, Commercial paper $ — $ 69,000 6.55% Notes due 2019 550,000 — 4.25% Notes due 2021 550,000 550,000 3.20% Notes due 2025 250,000 250,000 5.00% Notes due 2026 650,000 650,000 6.40% Notes due 2037 250,000 250,000 4.20% Notes due 2042 250,000 250,000 5.15% Notes due 2043 550,000 550,000 4.20% Notes due 2045 250,000 250,000 4.25% Notes due 2046 500,000 500,000 4.20% Notes due 2047 500,000 500,000 4.85% Notes due 2049 — 500,000 Face value of long-term debt 4,300,000 4,319,000 Unamortized debt issuance costs (1) (27,070 ) (31,671 ) Net unamortized debt discount (1) (2,927 ) (7,653 ) Net unamortized amount of gains from historical fair value hedges (1) 866 — Long-term debt, net, including current portion 4,270,869 4,279,676 Less: Current portion of long-term debt, net 59,489 — Long-term debt, net $ 4,211,380 $ 4,279,676 (1) Debt issuance costs, note discounts and premiums and realized gains and losses of historical fair value hedges are being amortized or accreted to the applicable notes over the respective lives of those notes. All of the instruments detailed in the table above are senior indebtedness. 2019 Debt Issuance On January 18, 2019, we issued $500.0 million of 4.85% senior notes due 2049 in an underwritten public offering. The notes were issued at 99.371% of par. Net proceeds from this offering were approximately $491.5 million after underwriting discounts and offering expenses. The net proceeds from this offering along with cash on hand were used to early redeem our $550.0 million of 6.55% senior notes due 2019 on February 11, 2019. We recognized $8.3 million of debt prepayment costs that were recorded as interest expense in our consolidated statements of income. Other Debt Revolving Credit Facility. At March 31, 2019 , the total borrowing capacity under our revolving credit facility maturing October 26, 2022 was $1.0 billion . Any borrowings outstanding under this facility are classified as long-term debt on our consolidated balance sheets. Borrowings under this facility are unsecured and bear interest at LIBOR plus a spread ranging from 1.000% to 1.625% based on our credit ratings. Additionally, an unused commitment fee is assessed at a rate between 0.100% and 0.275% depending on our credit ratings. The unused commitment fee was 0.125% at March 31, 2019 . Borrowings under this facility may be used for general partnership purposes, including capital expenditures. As of December 31, 2018 and March 31, 2019 , there were no borrowings outstanding under this facility, with $6.8 million and $3.5 million , respectively, obligated for letters of credit. Amounts obligated for letters of credit are not reflected as debt on our consolidated balance sheets, but decrease our borrowing capacity under this facility. Commercial Paper Program. We have a commercial paper program under which we may issue commercial paper notes in an amount up to the available capacity under our $1.0 billion revolving credit facility. The maturities of the commercial paper notes vary, but may not exceed 397 days from the date of issuance. Because the commercial paper we can issue is limited to amounts available under our revolving credit facility, amounts outstanding under the program are classified as long-term debt. The commercial paper notes are sold under customary terms in the commercial paper market and are issued at a discount from par, or alternatively, are sold at par and bear varying interest rates on a fixed or floating basis. The weighted-average interest rate for commercial paper borrowings based on the number of days outstanding was 2.3% for the year ended December 31, 2018 and 2.8% for the three months ended March 31, 2019 .

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Interest Rate Derivatives We periodically enter into interest rate derivatives to hedge the fair value of debt or hedge against variability in interest rates. For interest rate cash flow hedges, we record the noncurrent portion of unrealized gains or losses as an adjustment to other comprehensive income with the current portion recorded as an adjustment to interest expense. For fair value hedges on long-term debt, we record the noncurrent portion of gains or losses as an adjustment to long-term debt with the current portion recorded as an adjustment to interest expense. Adjustments resulting from discontinued hedges continue to be recognized in accordance with their historic hedging relationships. At March 31, 2019, we had $100.0 million of treasury lock agreements outstanding to protect against the risk of variability of a portion of debt issuances we anticipate to occur in 2019. The fair value of these interest rate derivative agreements at March 31, 2019 was recorded as a current liability of $4.5 million , with the offset recorded to other comprehensive income. We account for these agreements as cash flow hedges. In first quarter 2019, upon issuance of $500.0 million of 4.85% notes due 2049, we terminated and settled $150.0 million of treasury lock agreements that we had previously entered into to protect against the variability of interest payments on this anticipated debt issuance for a loss of $8.0 million . These agreements were accounted for as cash flow hedges. The loss was recorded to other comprehensive income and will be recognized into earnings as an adjustment to our periodic interest expense over the life of the debt issuance. Commodity Derivatives Our butane blending activities produce gasoline, and we can reasonably estimate the timing and quantities of sales of these products. We use a combination of exchange-traded commodities futures contracts and forward purchase and sale contracts to help manage commodity price changes and mitigate the risk of decline in the product margin realized from our butane blending activities. Further, certain of our other commercial operations generate petroleum products, and we also use futures contracts to hedge against price changes for some of these commodities. Forward physical purchase and sale contracts that qualify for and are elected as normal purchases and sales are accounted for using traditional accrual accounting, whereby changes in the mark-to-market values of such contracts are not recognized in income; rather the revenues and expenses associated with such transactions are recognized during the period when commodities are physically delivered or received. Physical forward commodity contracts subject to this exception are evaluated for the probability of future delivery and are periodically tested once the forecasted period has passed to determine whether similar forward contracts are probable of physical delivery in the future. We record the effective portion of the gains or losses for commodity-based contracts designated as fair value hedges as adjustments to the assets being hedged and the ineffective portions as well as amounts excluded from the assessment of hedge effectiveness as adjustments to other income or expense. We recognize the change in fair value of economic hedges that hedge against changes in the price of petroleum products that we expect to sell or purchase in the future currently in earnings as adjustments to product sales revenue, cost of product sales or operating expenses, as applicable. Our open futures contracts at March 31, 2019 were as follows: Type of Contract/Accounting Methodology Product Represented by the Contract and Associated Barrels Maturity Dates Futures - Economic Hedges 3.3 million barrels of refined products and crude oil Between April 2019 and January 2020 Futures - Economic Hedges 0.6 million barrels of butane and natural gasoline Between April 2019 and December 2019 Energy Commodity Derivatives Contracts and Deposits Offsets At March 31, 2019 , we had made margin deposits of $23.8 million for our future contracts with our counterparties, which were recorded as current assets under energy commodity derivatives deposits on our consolidated balance sheets. At December 31, 2018 we held margin deposits of $37.3 million for our future contracts with our counterparties, which were recorded as current liabilities under energy commodity derivatives deposits on our consolidated balance sheets. We have the right to offset the combined fair values of our open futures contracts against our margin deposits under a master netting arrangement for each counterparty; however, we have elected to present the combined fair values of our open futures contracts separately from the related margin deposits on our consolidated balance sheets. Additionally, we have the right to offset the fair values of our futures contracts together for each counterparty, which we have elected to do, and we report the combined net balances on our consolidated balance sheets. A schedule of the derivative amounts we have offset and the deposit amounts we could offset under a master netting arrangement are provided below as of December 31, 2018 and March 31, 2019 (in thousands): Description Gross Amounts of Recognized Assets (Liabilities) Gross Amounts of Assets (Liabilities) Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Margin Deposit Amounts Not Offset in the Consolidated Balance Sheets Net Asset Amount (1) As of 12/31/2018 $ 62,166 $ (7,155 ) $ 55,011 $ (37,328 ) $ 17,683 As of 3/31/2019 $ (13,869 ) $ 597 $ (13,272 ) $ 23,820 $ 10,548 (1) Amount represents the maximum loss we would incur if all of our counterparties failed to perform on their derivative contracts. Impact of Derivatives on Our Financial Statements Comprehensive Income The changes in derivative activity included in AOCL for the three months ended March 31, 2018 and 2019 were as follows (in thousands): Three Months Ended March 31, Derivative Losses Included in AOCL 2018 2019 Beginning balance $ (33,755 ) $ (26,480 ) Net gain (loss) on cash flow hedges 5,414 (4,376 ) Reclassification of net loss on cash flow hedges to income 740 627 Ending balance $ (27,601 ) $ (30,229 ) The following is a summary of the effect on our consolidated statements of income for the three months ended March 31, 2018 and 2019 of derivatives that were designated as cash flow hedges (in thousands): Interest Rate Contracts Amount of Gain (Loss) Recognized in AOCL on Derivatives Location of Loss Reclassified from AOCL into Income Amount of Loss Reclassified from AOCL into Income Three Months Ended March 31, 2018 $ 5,414 Interest expense $ (740 ) Three Months Ended March 31, 2019 $ (4,376 ) Interest expense $ (627 ) As of March 31, 2019 , the net loss estimated to be classified to interest expense over the next twelve months from AOCL is approximately $2.4 million . This amount relates to the amortization of losses on interest rate contracts over the life of the related debt instruments. The following table provides a summary of the effect on our consolidated statements of income for the three months ended March 31, 2018 and 2019 of derivatives accounted for as economic hedges (in thousands): Amount of Gain (Loss) Recognized on Derivatives Three Months Ended Location of Gain (Loss) Recognized on Derivatives March 31, Derivative Instrument 2018 2019 Futures contracts Product sales revenue $ (7,375 ) $ (54,511 ) Futures contracts Cost of product sales (3,944 ) 2,273 Total $ (11,319 ) $ (52,238 ) The impact of the derivatives in the above table was reflected as cash from operations on our consolidated statements of cash flows. Balance Sheets The following tables provide a summary of the fair value of derivatives , which are presented on a net basis in our consolidated balance sheets, that were designated as hedging instruments as of December 31, 2018 and March 31, 2019 (in thousands): December 31, 2018 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Futures contracts Energy commodity derivatives contracts, net $ 462 Energy commodity derivatives contracts, net $ — Interest rate contracts Other current assets 312 Other current liabilities 8,438 Total $ 774 Total $ 8,438 March 31, 2019 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Interest rate contracts Other current assets $ — Other current liabilities $ 4,474 The following tables provide a summary of the fair value of derivatives , which are presented on a net basis in our consolidated balance sheets, that were not designated as hedging instruments as of December 31, 2018 and March 31, 2019 (in thousands): December 31, 2018 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Futures contracts Energy commodity derivatives contracts, net $ 61,704 Energy commodity derivatives contracts, net $ 7,155 March 31, 2019 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Futures contracts Energy commodity derivatives contracts, net $ 597 Energy commodity derivatives contracts, net $ 13,869

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Butane Blending Patent Infringement Proceeding On October 4, 2017, Sunoco Partners Marketing & Terminals L.P. (“Sunoco”) brought an action for patent infringement in the U.S. District Court for the District of Delaware alleging Magellan Midstream Partners, L.P. (“Magellan”) and Powder Springs Logistics, LLC (“Powder Springs”) have infringed patents relating to butane blending at the Powder Springs facility located in Powder Springs, Georgia. Sunoco has since submitted pleadings alleging that Magellan has also infringed various patents relating to butane blending at nine Magellan facilities, in addition to Powder Springs. Sunoco is seeking an undetermined amount of damages, attorneys’ fees and a permanent injunction enjoining Magellan and Powder Springs from infringing on the subject patents. We deny and are vigorously defending against all claims asserted by Sunoco. Although it is not possible to predict the ultimate outcome, we believe, based on our current understanding of the applicable facts and law, that the ultimate resolution of this matter will not have a material adverse impact on our results of operations, financial position or cash flows. Environmental Liabilities Liabilities recognized for estimated environmental costs were $20.5 million and $18.6 million at December 31, 2018 and March 31, 2019 , respectively. We have classified environmental liabilities as current or noncurrent based on management’s estimates regarding the timing of actual payments. Environmental expenses recognized as a result of changes in our environmental liabilities are generally included in operating expenses on our consolidated statements of income. Environmental expenses were $2.5 million and $2.0 million for the three months ended March 31, 2018 and 2019 , respectively. Environmental Receivables Receivables from insurance carriers and other third parties related to environmental matters were $4.1 million at December 31, 2018 , of which $2.4 million and $1.7 million were recorded to other accounts receivable and long-term receivables, respectively, on our consolidated balance sheets. Receivables from insurance carriers and other third parties related to environmental matters were $4.0 million at March 31, 2019 , of which $2.4 million and $1.6 million were recorded to other accounts receivable and long-term receivables, respectively, on our consolidated balance sheets. Other In connection with the sale of part of our interest in BridgeTex in third quarter 2018, we agreed to indemnify an affiliate of OMERS Infrastructure Management Inc. (“OMERS”) for certain claims involving BridgeTex. The maximum obligation is limited to the net proceeds we received. We probability-weighted potential outcome scenarios to estimate our possible liability for specific events covered by such indemnification obligations. As a result, we reduced the gain recognized on the transaction by $16.0 million and recorded the same estimate in other noncurrent liabilities on our consolidated balance sheets during 2018. In first quarter 2019, certain litigation subject to the indemnification agreement was settled, which resulted in our paying $5.0 million under the indemnification agreement and our recognizing the reduction of the remaining $11.0 million liability as an additional gain on disposition of assets on our consolidated statements of income. We have entered into an agreement to guarantee our 50% pro rata share, up to $25.0 million , of obligations under Powder Springs’ credit facility. As of March 31, 2019 , our consolidated balance sheets reflected a $0.4 million other current liability and a corresponding increase in our investment in non-controlled entities on our consolidated balance sheets to reflect the fair value of this guarantee. We are a party to various other claims, legal actions and complaints arising in the ordinary course of business. While the results cannot be predicted with certainty, management believes the ultimate resolution of these claims, legal actions and complaints after consideration of amounts accrued, insurance coverage or other indemnification arrangements will not have a material adverse effect on our results of operations, financial position or cash flows.

Long-Term Incentive Plan

Long-Term Incentive Plan	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Long-Term Incentive Plan	Long-Term Incentive Plan The compensation committee of our general partner’s board of directors administers our long-term incentive plan (“LTIP”) covering certain of our employees and the independent directors of our general partner. The LTIP primarily consists of phantom units and permits the grant of awards covering an aggregate payout of 11.9 million of our limited partner units. The estimated units remaining available under the LTIP at March 31, 2019 total 1.6 million . Our equity-based incentive compensation expense was as follows (in thousands): Three Months Ended March 31, 2018 2019 Performance-based awards $ 5,924 $ 3,644 Time-based awards 708 1,270 Total $ 6,632 $ 4,914 Allocation of LTIP expense on our consolidated statements of income: G&A expense $ 6,577 $ 4,871 Operating expense 55 43 Total $ 6,632 $ 4,914 On February 1, 2019, 347,473 unit awards were granted pursuant to our LTIP. These awards included both performance-based and time-based awards and have a three -year vesting period that will end on December 31, 2021. Basic and Diluted Net Income Per Limited Partner Unit The difference between our actual limited partner units outstanding and our weighted-average number of limited partner units outstanding used to calculate basic net income per unit is due to the impact of: (i) the unit awards issued to non-employee directors and (ii) the weighted average effect of units actually issued during a period. The difference between the weighted-average number of limited partner units outstanding used for basic and diluted net income per unit calculations on our consolidated statements of income is primarily the dilutive effect of unit awards associated with our LTIP that have not yet vested.

Partners' Capital and Distribut

Partners' Capital and Distributions	3 Months Ended
	Mar. 31, 2019
Partners' Capital Notes [Abstract]
Partners' Capital and Distributions	Partners’ Capital and Distributions Partners’ Capital In May 2017, we filed a prospectus supplement to the shelf registration statement for our continuous equity offering program (which we refer to as an at-the-market program, or “ATM”) pursuant to which we may issue up to $750.0 million of common units in amounts, at prices and on terms to be determined by market conditions at the time. The net proceeds from any sales under the ATM, after deducting the sales agents’ commissions and our offering expenses, will be used for general partnership purposes, including repayment of indebtedness or capital expenditures. No units have been issued pursuant to this program. The following table details the changes in the number of our limited partner units outstanding from December 31, 2018 through March 31, 2019 : Limited partner units outstanding on December 31, 2018 228,195,160 February 2019–Settlement of employee LTIP awards 199,792 During 2019–Other (a) 8,476 Limited partner units outstanding on March 31, 2019 228,403,428 (a) Limited partner units issued to settle the equity-based retainers paid to four independent directors of our general partner. Distributions Distributions we paid during 2018 and 2019 were as follows (in thousands, except per unit amounts): Payment Date Per Unit Cash Distribution Amount Total Cash Distribution to Limited Partners 02/14/2018 $ 0.9200 $ 209,940 05/15/2018 0.9375 213,933 08/14/2018 0.9575 218,497 11/14/2018 0.9775 223,061 Total $ 3.7925 $ 865,431 02/14/2019 $ 0.9975 $ 227,832 05/15/2019 (a) 1.0050 229,545 Total $ 2.0025 $ 457,377 (a) Our general partner’s board of directors declared this cash distribution in April 2019 to be paid on May 15, 2019 to unitholders of record at the close of business on May 8, 2019 .

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair Value Methods and Assumptions - Financial Assets and Liabilities. We used the following methods and assumptions in estimating fair value of our financial assets and liabilities: • Energy commodity derivatives contracts . These include exchange-traded futures contracts related to petroleum products. These contracts are carried at fair value on our consolidated balance sheets and are valued based on quoted prices in active markets. See Note 9 – Derivative Financial Instruments for further disclosures regarding these contracts. • Interest rate contracts. These include forward-starting interest rate hedge agreements to protect against the risk of variability of interest payments on future debt. These contracts are carried at fair value on our consolidated balance sheets and are valued based on an assumed exchange, at the end of each period, in an orderly transaction with a participant in the market in which the financial instrument is traded. The exchange value was calculated using present value techniques on estimated future cash flows based on forward interest rate curves. See Note 9 – Derivative Financial Instruments for further disclosures regarding these contracts. • Long-term receivables. These primarily include payments receivable under a sales-type leasing arrangement and cost reimbursement payments receivable. These receivables were recorded at fair value on our consolidated balance sheets, using then-current market rates to estimate the present value of future cash flows. • Guarantees. At December 31, 2018, these guarantees primarily included an indemnity agreement we entered into with an affiliate of OMERS in connection with the partial sale of our interest in BridgeTex. This indemnification was recorded at fair value on our consolidated balance sheets upon initial recognition, using probability-weighted potential outcome scenarios to estimate our possible liability for specific events covered by this indemnification. During first quarter 2019, certain litigation subject to the indemnity agreement was settled. • Debt. The fair value of our publicly traded notes was based on the prices of those notes at December 31, 2018 and March 31, 2019 ; however, where recent observable market trades were not available, prices were determined using adjustments to the last traded value for that debt issuance or by adjustments to the prices of similar debt instruments of peer entities that are actively traded. The carrying amount of borrowings, if any, under our revolving credit facility and our commercial paper program approximates fair value due to the frequent repricing of these obligations. Fair Value Measurements - Financial Assets and Liabilities The following tables summarize the carrying amounts, fair values and fair value measurements recorded or disclosed as of December 31, 2018 and March 31, 2019 based on the three levels established by ASC 820, Fair Value Measurements and Disclosures (in thousands): December 31, 2018 Assets (Liabilities) Fair Value Measurements using: Carrying Amount Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Energy commodity derivatives contracts $ 55,011 $ 55,011 $ 55,011 $ — $ — Interest rate contracts $ (8,126 ) $ (8,126 ) $ — $ (8,126 ) $ — Long-term receivables $ 20,844 $ 20,844 $ — $ — $ 20,844 Guarantees $ (16,409 ) $ (16,409 ) $ — $ — $ (16,409 ) Debt $ (4,270,869 ) $ (4,224,373 ) $ — $ (4,224,373 ) $ — March 31, 2019 Assets (Liabilities) Fair Value Measurements using: Carrying Amount Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Energy commodity derivatives contracts $ (13,272 ) $ (13,272 ) $ (13,272 ) $ — $ — Interest rate contracts $ (4,474 ) $ (4,474 ) $ — $ (4,474 ) $ — Long-term receivables $ 20,646 $ 20,646 $ — $ — $ 20,646 Guarantees $ (408 ) $ (408 ) $ — $ — $ (408 ) Debt $ (4,279,676 ) $ (4,449,954 ) $ — $ (4,449,954 ) $ —

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Stacy P. Methvin is an independent member of our general partner’s board of directors and is also a director of one of our customers. We received tariff and other ancillary revenue from this customer of $3.8 million and $7.3 million for the three months ended March 31, 2018 and 2019 , respectively. We recorded receivables of $1.9 million and $2.6 million from this customer at December 31, 2018 and March 31, 2019 , respectively. The tariff revenue we recognized from this customer was in the normal course of business, with rates determined in accordance with published tariffs. See Note 4 – Investments in Non-Controlled Entities for details of transactions with our joint ventures.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Recognizable events No recognizable events occurred subsequent to March 31, 2019 . Non-recognizable events Cash Distribution. In April 2019, our general partner’s board of directors declared a quarterly distribution of $1.005 per unit for the period of January 1, 2019 through March 31, 2019. This quarterly cash distribution will be paid on May 15, 2019 to unitholders of record on May 8, 2019 . The total cash distributions expected to be paid under this declaration are approximately $229.5 million .

Organization, Description of _2

Organization, Description of Business And Basis Of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation In the opinion of management, our accompanying consolidated financial statements which are unaudited, except for the consolidated balance sheet as of December 31, 2018 , which is derived from our audited financial statements, include all normal and recurring adjustments necessary to present fairly our financial position as of March 31, 2019 , the results of operations for the three months ended March 31, 2018 and 2019 and cash flows for the three months ended March 31, 2018 and 2019 . The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the full year ending December 31, 2019 for several reasons. Profits from our butane blending activities are realized largely during the first and fourth quarters of each year. Additionally, gasoline demand, which drives transportation volumes and revenues on our refined products pipeline system, generally trends higher during the summer driving months. Further, the volatility of commodity prices impacts the profits from our commodity activities and, to a lesser extent, the volume of petroleum products we transport on our pipelines. Pursuant to the rules and regulations of the Securities and Exchange Commission, the financial statements in this report do not include all of the information and notes normally included with financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018 .
Use of Estimates	Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities that exist at the date of our consolidated financial statements, as well as their impact on the reported amounts of revenue and expense during the reporting periods. Actual results could differ from those estimates.
New Accounting Pronouncements	New Accounting Pronouncements - Adopted by us on January 1, 2019 In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842). This ASU requires lessees to recognize a right of use asset and lease liability on the balance sheet for all leases, with the exception of short-term leases. The new accounting model for lessors remains largely the same, although some changes have been made to align it with the new lessee model and the new revenue recognition guidance. This update also requires companies to include additional disclosures regarding their lessee and lessor agreements. We adopted this standard on January 1, 2019, and it did not have a material impact on our consolidated statements of income or our leverage ratio as defined in our credit agreement. Adoption of this ASU resulted in an increase in our assets and liabilities by approximately $172 million due to the recognition of right of use assets and lease liabilities. See Note 7 – Leases for our lease disclosures.
Lease Policy, Lessee and Lessor	As of January 1, 2019, we adopted ASU 2016-02, Leases (Topic 842) using the modified retrospective method of adoption. We elected to use the transition option that allows us to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment (if any) to the opening balance of retained earnings in the year of adoption. Comparable periods continue to be presented under the guidance of the previous standard, ASC 840. ASC 842 requires lessees to recognize a lease liability and right-of-use asset on the balance sheet for operating leases. For lessors, the new accounting model remains largely the same, although some changes have been made to align it with the new lessee model and the new revenue recognition guidance, ASC 606, Revenue from Contracts with Customers . Our adoption of ASC 842 did not result in any material adjustments to retained earnings, changes in the timing or amounts of lease costs or changes to our leverage ratio as defined in our credit agreement. We have both lessee and lessor arrangements. Our leases are evaluated at inception or at any subsequent modification. Depending on the terms, leases are classified as either operating or finance leases if we are the lessee, or as operating, sales-type or direct financing leases if we are the lessor, as appropriate under ASC 842. Our lessee arrangements primarily include a terminalling and storage contract where we have exclusive use of dedicated tankage, leased pipelines and office buildings. Our lessor arrangements include pipeline capacity and storage contracts and our condensate splitter tolling agreement that qualify as operating leases under ASC 842. In addition, we have a long-term throughput and deficiency agreement with a customer that is being accounted for as a sales-type lease under ASC 842. In accordance with ASC 842, we have made an accounting policy election to not apply the new standard to lessee arrangements with a term of one year or less and no purchase option that is reasonably certain of exercise. We will continue to account for these short-term arrangements by recognizing payments and expenses as incurred, without recording a lease liability and right-of-use asset. We have also made an accounting policy election for both our lessee and lessor arrangements to combine lease and non-lease components. This election is applied to all of our lease arrangements as our non-lease components are not material and do not result in significant timing differences in the recognition of rental expenses or income.
Lessee, Leases	We recognize a lease liability for each lease based on the present value of remaining minimum fixed rental payments (which includes payments under any renewal option that we are reasonably certain to exercise), using a discount rate that approximates the rate of interest we would have to pay to borrow on a collateralized basis over a similar term. We also recognize a right-of-use asset for each lease, valued at the lease liability, adjusted for prepaid or accrued rent balances existing at the time of initial recognition. The lease liability and right-of-use asset are reduced over the term of the lease as payments are made and the assets are used. Related Party Operating Lease. In third quarter 2018, we entered into a long-term terminalling and storage contract with our equity investee, Seabrook, where we have exclusive use of dedicated tankage that is utilized to provide our customers with crude oil storage capacity and dock access for crude oil imports and exports on the Texas Gulf Coast. This arrangement meets the definition of an operating lease, and our lease liability includes renewal options necessary to maintain control of the assets for a time period sufficient to meet our performance obligations to our third-party customers. Minimum fixed rental payments are recognized on a straight-line basis over the life of the lease as costs and expenses on our consolidated statements of income. Variable and short-term rental payments are recognized as costs and expenses as they are incurred. Variable payments consist of amounts that exceed the contractual minimum rental payment (for example, incremental payment increases tied to a change in a market index).
Lessor, Leases	We recognize fixed rental income on a straight-line basis over the life of the lease as revenue on our consolidated statements of income. Variable rental payments are recognized as revenue in the period in which the changes in facts and circumstances on which the variable lease payments are based occur.

Revenue from Contract with Cu_2

Revenue from Contract with Customers (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Products and Services	The following tables provide details of our revenues disaggregated by key activities that comprise our performance obligations by operating segment (in thousands): Three Months Ended March 31, 2018 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation $ 166,902 $ 79,123 $ — $ — $ 246,025 Terminalling 39,348 — 712 — 40,060 Storage 25,247 29,990 34,211 (915 ) 88,533 Ancillary services 25,788 5,035 7,034 — 37,857 Lease revenue 3,109 12,110 4,243 — 19,462 Transportation and terminals revenue 260,394 126,258 46,200 (915 ) 431,937 Product sales revenue 232,774 6,439 2,379 — 241,592 Affiliate management fee revenue 297 4,016 937 — 5,250 Total revenue 493,465 136,713 49,516 (915 ) 678,779 Revenue not under the guidance of ASC 606: Lease revenue (1) (3,109 ) (12,110 ) (4,243 ) — (19,462 ) Losses from futures contracts included in product sales revenue (2) 5,465 1,910 — — 7,375 Affiliate management fee revenue (297 ) (4,016 ) (937 ) — (5,250 ) Total revenue from contracts with customers under ASC 606 $ 495,524 $ 122,497 $ 44,336 $ (915 ) $ 661,442 (1) Lease revenue in 2018 is accounted for under ASC 840, Leases . (2) The impact on product sales revenue from futures contracts falls under the guidance of ASC 815, Derivatives and Hedging . Three Months Ended March 31, 2019 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation $ 171,027 $ 85,158 $ — $ — $ 256,185 Terminalling 40,398 5,246 899 — 46,543 Storage 26,439 34,318 35,218 (938 ) 95,037 Ancillary services 25,896 6,021 6,885 — 38,802 Lease revenue 3,245 16,865 4,115 — 24,225 Transportation and terminals revenue 267,005 147,608 47,117 (938 ) 460,792 Product sales revenue 155,156 5,713 2,126 — 162,995 Affiliate management fee revenue 412 3,486 1,250 — 5,148 Total revenue 422,573 156,807 50,493 (938 ) 628,935 Revenue not under the guidance of ASC 606: Lease revenue (1) (3,245 ) (16,865 ) (4,115 ) — (24,225 ) Losses from futures contracts included in product sales revenue (2) 52,109 2,402 — — 54,511 Affiliate management fee revenue (412 ) (3,486 ) (1,250 ) — (5,148 ) Total revenue from contracts with customers under ASC 606 $ 471,025 $ 138,858 $ 45,128 $ (938 ) $ 654,073 (1) Lease revenue in 2019 is accounted for under ASC 842, Leases . (2) The impact on product sales revenue from futures contracts falls under the guidance of ASC 815, Derivatives and Hedging .
Contract with Customer, Asset and Liability	The following table summarizes our accounts receivable, contract assets and contract liabilities resulting from contracts with customers (in thousands): December 31, 2018 March 31, 2019 Accounts receivable from contracts with customers $ 102,684 $ 130,257 Contract assets $ 8,487 $ 8,618 Contract liabilities $ 122,129 $ 124,439
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table provides the aggregate amount of the transaction price allocated to our unfulfilled performance obligations (“UPOs”) as of March 31, 2019 by operating segment, including the range of years remaining on our contracts with customers and an estimate of revenues expected to be recognized over the next 12 months (dollars in thousands): Refined Products Crude Oil Marine Storage Total Balances at 3/31/2019 $ 2,082,007 $ 1,270,411 $ 239,820 $ 3,592,238 Remaining terms 1 - 19 years 1 - 10 years 1 - 5 years Estimated revenues from UPOs to be recognized in the next 12 months $ 289,218 $ 327,365 $ 115,727 $ 732,310

Segment Disclosures (Tables)

Segment Disclosures (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Schedule of Business Segment Reporting Information	Three Months Ended March 31, 2018 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation and terminals revenue $ 260,394 $ 126,258 $ 46,200 $ (915 ) $ 431,937 Product sales revenue 232,774 6,439 2,379 — 241,592 Affiliate management fee revenue 297 4,016 937 — 5,250 Total revenue 493,465 136,713 49,516 (915 ) 678,779 Operating expenses 94,049 33,591 17,964 (2,308 ) 143,296 Cost of product sales 190,333 7,050 2,209 — 199,592 Earnings of non-controlled entities (2,318 ) (31,608 ) (612 ) — (34,538 ) Operating margin 211,401 127,680 29,955 1,393 370,429 Depreciation, amortization and impairment expense 28,907 12,762 8,817 1,393 51,879 G&A expense 28,887 11,906 5,763 — 46,556 Operating profit $ 153,607 $ 103,012 $ 15,375 $ — $ 271,994 Three Months Ended March 31, 2019 Refined Products Crude Oil Marine Storage Intersegment Eliminations Total Transportation and terminals revenue $ 267,005 $ 147,608 $ 47,117 $ (938 ) $ 460,792 Product sales revenue 155,156 5,713 2,126 — 162,995 Affiliate management fee revenue 412 3,486 1,250 — 5,148 Total revenue 422,573 156,807 50,493 (938 ) 628,935 Operating expenses 89,678 43,823 14,897 (2,373 ) 146,025 Cost of product sales 160,154 6,664 2,276 — 169,094 Other income (614 ) (1,573 ) (4,754 ) — (6,941 ) (Earnings) losses of non-controlled entities 1,430 (32,302 ) (383 ) — (31,255 ) Operating margin 171,925 140,195 38,457 1,435 352,012 Depreciation, amortization and impairment expense 35,534 15,259 9,643 1,435 61,871 G&A expense 27,715 12,615 5,665 — 45,995 Operating profit $ 108,676 $ 112,321 $ 23,149 $ — $ 244,146

Investments in Non-Controlled_2

Investments in Non-Controlled Entities (Tables)	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Our investments in non-controlled entities at March 31, 2019 were comprised of: Entity Ownership Interest BridgeTex Pipeline Company, LLC (“BridgeTex”) 30% Double Eagle Pipeline LLC (“Double Eagle”) 50% HoustonLink Pipeline Company, LLC (“HoustonLink”) 50% MVP Terminalling, LLC (“MVP”) 50% Powder Springs Logistics, LLC (“Powder Springs”) 50% Saddlehorn Pipeline Company, LLC (“Saddlehorn”) 40% Seabrook Logistics, LLC (“Seabrook”) 50% Texas Frontera, LLC (“Texas Frontera”) 50% We serve as operator of BridgeTex, HoustonLink, MVP, Powder Springs, Saddlehorn, Texas Frontera and the pipeline activities of Seabrook. We receive fees for management services as well as reimbursement or payment to us for certain direct operational payroll and other overhead costs. The management fees we have received are reported as affiliate management fee revenue on our consolidated statements of income. Cost reimbursements we receive from these entities in connection with our operating services are included as reductions to costs and expenses on our consolidated statements of income and totaled $0.5 million and $1.5 million during the three months ended March 31, 2018 and 2019 , respectively. We recorded the following revenue and expense transactions from certain of these non-controlled entities in our consolidated statements of income (in thousands): Three Months Ended March 31, 2018 2019 Transportation and terminals revenue: BridgeTex, pipeline capacity and storage $ 9,864 $ 10,145 Double Eagle, throughput revenue $ 1,544 $ 1,659 Saddlehorn, storage revenue $ 538 $ 552 Operating costs: Seabrook, storage lease and ancillary services $ — $ 6,909 Product sales revenue: Powder Springs, butane sales $ 2,719 $ — Our consolidated balance sheets reflected the following balances related to our investments in non-controlled entities (in thousands): December 31, 2018 Trade Accounts Receivable Other Accounts Receivable Other Accounts Payable Long-Term Receivables BridgeTex $ 318 $ 1,549 $ — $ — Double Eagle $ 546 $ — $ — $ — MVP $ — $ 397 $ — $ — Powder Springs $ — $ — $ — $ 2,221 Saddlehorn $ — $ 183 $ — $ — Seabrook $ — $ — $ 1,140 $ — March 31, 2019 Trade Accounts Receivable Other Accounts Receivable Other Accounts Payable Long-Term Receivables BridgeTex $ 284 $ 779 $ 179 $ — Double Eagle $ 583 $ — $ — $ — MVP $ — $ 361 $ — $ — Powder Springs $ — $ 269 $ — $ 2,725 Saddlehorn $ — $ 109 $ — $ — Seabrook $ — $ — $ 1,646 $ — Texas Frontera $ — $ — $ 83 $ — The financial results from MVP and Texas Frontera are included in our marine storage segment, the financial results from BridgeTex, Double Eagle, HoustonLink, Saddlehorn and Seabrook are included in our crude oil segment and the financial results from Powder Springs are included in our refined products segment, each as earnings of non-controlled entities. A summary of our investments in non-controlled entities follows (in thousands): Investments at 12/31/2018 $ 1,076,306 Additional investment 76,634 Indemnification settlement (5,000 ) Earnings of non-controlled entities: Proportionate share of earnings 31,719 Amortization of excess investment and capitalized interest (464 ) Earnings of non-controlled entities 31,255 Less: Distributions from operations of non-controlled entities 43,069 Distributions from returns of investments in non-controlled entities 7,500 Investments at 3/31/2019 $ 1,128,626

Inventory (Tables)

Inventory (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventory at December 31, 2018 and March 31, 2019 was as follows (in thousands): December 31, 2018 March 31, Refined products $ 92,751 $ 80,437 Liquefied petroleum gases 46,612 52,725 Transmix 28,497 35,947 Crude oil 11,220 19,557 Additives 6,655 6,382 Total inventory $ 185,735 $ 195,048

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity	Future minimum rental payments under operating leases with initial terms greater than one year as of March 31, 2019, are as follows (in thousands): Third Party Leases Seabrook Lease All Leases 2019 $ 15,889 $ 8,266 $ 24,155 2020 18,948 11,021 29,969 2021 18,994 9,368 28,362 2022 18,868 6,612 25,480 2023 18,419 6,612 25,031 Thereafter 29,867 37,471 67,338 Total future minimum rental payments 120,985 79,350 200,335 Present value discount 14,691 13,777 28,468 Total operating lease liability $ 106,294 $ 65,573 $ 171,867
Lessee, Operating Lease, Disclosure	The following table provides further information about our operating leases as of and for the three months ended March 31, 2019 (dollars in thousands): Third Party Leases Seabrook Lease All Leases Current lease liability $ 14,828 $ 8,436 $ 23,264 Long-term lease liability $ 91,466 $ 57,137 $ 148,603 Right-of-use asset $ 106,532 $ 65,573 $ 172,105 Fixed lease cost $ 4,821 $ 2,755 $ 7,576 Short-term lease cost 457 — 457 Variable lease cost 371 — 371 Total lease cost $ 5,649 $ 2,755 $ 8,404 Operating cash flows from operating leases $ 3,226 2,755 $ 5,981 Weighted average remaining lease term (years) 7 9 8 Weighted-average discount rate 4.1% 4.3% 4.2%
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum payments receivable under operating leases with terms greater than one year as of March 31, 2019 are estimated as follows (in thousands): 2019 $ 30,892 2020 33,770 2021 33,583 2022 23,486 2023 7,699 Thereafter 16,019 Total $ 145,449
Sales-type and Direct Financing Leases, Lease Receivable, Maturity	The net investment under this arrangement as of December 31, 2018 and March 31, 2019 was as follows (in thousands): December 31, 2018 March 31, 2019 Total minimum lease payments receivable $ 17,468 $ 17,031 Less: Unearned income 3,422 3,265 Recorded net investment in sales-type lease $ 14,046 $ 13,766 The net investment in sales-type leases was classified in the consolidated balance sheets as follows (in thousands): December 31, 2018 March 31, 2019 Other accounts receivable $ 1,138 $ 1,151 Long-term receivables 12,908 12,615 Total $ 14,046 $ 13,766 Future minimum payments receivable under this lease are $1.3 million in 2019, $1.7 million in 2020, $1.7 million in 2021, $1.7 million in 2022, $1.7 million in 2023 and $8.7 million thereafter.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Schedule of Consolidated Net Periodic Benefit Costs	Net periodic benefit expense for the three months ended March 31, 2018 and 2019 was as follows (in thousands): Three Months Ended Three Months Ended March 31, 2018 March 31, 2019 Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Components of net periodic benefit costs: Service cost $ 15,700 $ 65 $ 6,527 $ 54 Interest cost 6,443 106 3,000 119 Expected return on plan assets (2,978 ) — (2,374 ) — Amortization of prior service credit (45 ) — (45 ) — Amortization of actuarial loss 4,954 160 1,277 71 Net periodic benefit cost $ 24,074 $ 331 $ 8,385 $ 244 The service component of our net periodic benefit costs is presented in operating expense and G&A expense, and the non-service components are presented in other expense in our consolidated statements of income.
Schedule of Amounts Recognized in Other Comprehensive Loss	The changes in accumulated other comprehensive loss (“AOCL”) related to employee benefit plan assets and benefit obligations for the three months ended March 31, 2018 and 2019 were as follows (in thousands): Three Months Ended Three Months Ended March 31, 2018 March 31, 2019 Gains (Losses) Included in AOCL Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Beginning balance $ (97,226 ) $ (6,597 ) $ (88,602 ) $ (5,409 ) Net actuarial loss (5,944 ) — — — Amortization of prior service credit (45 ) — (45 ) — Amortization of actuarial loss 4,954 160 1,277 71 Ending balance $ (98,261 ) $ (6,437 ) $ (87,370 ) $ (5,338 )

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Consolidated Debt	Long-term debt at December 31, 2018 and March 31, 2019 was as follows (in thousands): December 31, March 31, Commercial paper $ — $ 69,000 6.55% Notes due 2019 550,000 — 4.25% Notes due 2021 550,000 550,000 3.20% Notes due 2025 250,000 250,000 5.00% Notes due 2026 650,000 650,000 6.40% Notes due 2037 250,000 250,000 4.20% Notes due 2042 250,000 250,000 5.15% Notes due 2043 550,000 550,000 4.20% Notes due 2045 250,000 250,000 4.25% Notes due 2046 500,000 500,000 4.20% Notes due 2047 500,000 500,000 4.85% Notes due 2049 — 500,000 Face value of long-term debt 4,300,000 4,319,000 Unamortized debt issuance costs (1) (27,070 ) (31,671 ) Net unamortized debt discount (1) (2,927 ) (7,653 ) Net unamortized amount of gains from historical fair value hedges (1) 866 — Long-term debt, net, including current portion 4,270,869 4,279,676 Less: Current portion of long-term debt, net 59,489 — Long-term debt, net $ 4,211,380 $ 4,279,676 (1) Debt issuance costs, note discounts and premiums and realized gains and losses of historical fair value hedges are being amortized or accreted to the applicable notes over the respective lives of those notes.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of NYMEX Contracts And Butane Price Swap Purchase Agreements	Our open futures contracts at March 31, 2019 were as follows: Type of Contract/Accounting Methodology Product Represented by the Contract and Associated Barrels Maturity Dates Futures - Economic Hedges 3.3 million barrels of refined products and crude oil Between April 2019 and January 2020 Futures - Economic Hedges 0.6 million barrels of butane and natural gasoline Between April 2019 and December 2019
Derivatives and Offset Amounts	A schedule of the derivative amounts we have offset and the deposit amounts we could offset under a master netting arrangement are provided below as of December 31, 2018 and March 31, 2019 (in thousands): Description Gross Amounts of Recognized Assets (Liabilities) Gross Amounts of Assets (Liabilities) Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Margin Deposit Amounts Not Offset in the Consolidated Balance Sheets Net Asset Amount (1) As of 12/31/2018 $ 62,166 $ (7,155 ) $ 55,011 $ (37,328 ) $ 17,683 As of 3/31/2019 $ (13,869 ) $ 597 $ (13,272 ) $ 23,820 $ 10,548 (1) Amount represents the maximum loss we would incur if all of our counterparties failed to perform on their derivative contracts.
Derivative Gains Included in Accumulated Other Comprehensive Loss (AOCL)	The changes in derivative activity included in AOCL for the three months ended March 31, 2018 and 2019 were as follows (in thousands): Three Months Ended March 31, Derivative Losses Included in AOCL 2018 2019 Beginning balance $ (33,755 ) $ (26,480 ) Net gain (loss) on cash flow hedges 5,414 (4,376 ) Reclassification of net loss on cash flow hedges to income 740 627 Ending balance $ (27,601 ) $ (30,229 )
Derivatives and Hedging-Cash Flow Hedges	The following is a summary of the effect on our consolidated statements of income for the three months ended March 31, 2018 and 2019 of derivatives that were designated as cash flow hedges (in thousands): Interest Rate Contracts Amount of Gain (Loss) Recognized in AOCL on Derivatives Location of Loss Reclassified from AOCL into Income Amount of Loss Reclassified from AOCL into Income Three Months Ended March 31, 2018 $ 5,414 Interest expense $ (740 ) Three Months Ended March 31, 2019 $ (4,376 ) Interest expense $ (627 )
Derivatives and Hedging-Overall-Subsequent Measurement	The following table provides a summary of the effect on our consolidated statements of income for the three months ended March 31, 2018 and 2019 of derivatives accounted for as economic hedges (in thousands): Amount of Gain (Loss) Recognized on Derivatives Three Months Ended Location of Gain (Loss) Recognized on Derivatives March 31, Derivative Instrument 2018 2019 Futures contracts Product sales revenue $ (7,375 ) $ (54,511 ) Futures contracts Cost of product sales (3,944 ) 2,273 Total $ (11,319 ) $ (52,238 )
Derivatives and Hedging-Designated	The following tables provide a summary of the fair value of derivatives , which are presented on a net basis in our consolidated balance sheets, that were designated as hedging instruments as of December 31, 2018 and March 31, 2019 (in thousands): December 31, 2018 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Futures contracts Energy commodity derivatives contracts, net $ 462 Energy commodity derivatives contracts, net $ — Interest rate contracts Other current assets 312 Other current liabilities 8,438 Total $ 774 Total $ 8,438 March 31, 2019 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Interest rate contracts Other current assets $ — Other current liabilities $ 4,474 The following tables provide a summary of the fair value of derivatives , which are presented on a net basis in our consolidated balance sheets, that were not designated as hedging instruments as of December 31, 2018 and March 31, 2019 (in thousands): December 31, 2018 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Futures contracts Energy commodity derivatives contracts, net $ 61,704 Energy commodity derivatives contracts, net $ 7,155 March 31, 2019 Asset Derivatives Liability Derivatives Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Futures contracts Energy commodity derivatives contracts, net $ 597 Energy commodity derivatives contracts, net $ 13,869

Long-Term Incentive Plan (Table

Long-Term Incentive Plan (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Incentive Compensation Expense	Our equity-based incentive compensation expense was as follows (in thousands): Three Months Ended March 31, 2018 2019 Performance-based awards $ 5,924 $ 3,644 Time-based awards 708 1,270 Total $ 6,632 $ 4,914 Allocation of LTIP expense on our consolidated statements of income: G&A expense $ 6,577 $ 4,871 Operating expense 55 43 Total $ 6,632 $ 4,914

Partners' Capital and Distrib_2

Partners' Capital and Distributions (Tables)	3 Months Ended
	Mar. 31, 2019
Partners' Capital Notes [Abstract]
Schedule of Capital Units	The following table details the changes in the number of our limited partner units outstanding from December 31, 2018 through March 31, 2019 : Limited partner units outstanding on December 31, 2018 228,195,160 February 2019–Settlement of employee LTIP awards 199,792 During 2019–Other (a) 8,476 Limited partner units outstanding on March 31, 2019 228,403,428 (a) Limited partner units issued to settle the equity-based retainers paid to four independent directors of our general partner.
Schedule of Distributions	Distributions we paid during 2018 and 2019 were as follows (in thousands, except per unit amounts): Payment Date Per Unit Cash Distribution Amount Total Cash Distribution to Limited Partners 02/14/2018 $ 0.9200 $ 209,940 05/15/2018 0.9375 213,933 08/14/2018 0.9575 218,497 11/14/2018 0.9775 223,061 Total $ 3.7925 $ 865,431 02/14/2019 $ 0.9975 $ 227,832 05/15/2019 (a) 1.0050 229,545 Total $ 2.0025 $ 457,377 (a) Our general partner’s board of directors declared this cash distribution in April 2019 to be paid on May 15, 2019 to unitholders of record at the close of business on May 8, 2019 .

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables summarize the carrying amounts, fair values and fair value measurements recorded or disclosed as of December 31, 2018 and March 31, 2019 based on the three levels established by ASC 820, Fair Value Measurements and Disclosures (in thousands): December 31, 2018 Assets (Liabilities) Fair Value Measurements using: Carrying Amount Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Energy commodity derivatives contracts $ 55,011 $ 55,011 $ 55,011 $ — $ — Interest rate contracts $ (8,126 ) $ (8,126 ) $ — $ (8,126 ) $ — Long-term receivables $ 20,844 $ 20,844 $ — $ — $ 20,844 Guarantees $ (16,409 ) $ (16,409 ) $ — $ — $ (16,409 ) Debt $ (4,270,869 ) $ (4,224,373 ) $ — $ (4,224,373 ) $ — March 31, 2019 Assets (Liabilities) Fair Value Measurements using: Carrying Amount Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Energy commodity derivatives contracts $ (13,272 ) $ (13,272 ) $ (13,272 ) $ — $ — Interest rate contracts $ (4,474 ) $ (4,474 ) $ — $ (4,474 ) $ — Long-term receivables $ 20,646 $ 20,646 $ — $ — $ 20,646 Guarantees $ (408 ) $ (408 ) $ — $ — $ (408 ) Debt $ (4,279,676 ) $ (4,449,954 ) $ — $ (4,449,954 ) $ —

Organization, Description of _3

Organization, Description of Business and Basis of Presentation (Narrative) (Details) bbl in Millions, $ in Millions	Jan. 01, 2019USD ($)	Mar. 31, 2019Terminalbblmi
Refined Products Segment [Member]
Organization and Description of Business [Line Items]
Number of Pipeline Terminals | Terminal		53
Number of Independent Terminals | Terminal		25
Refined Products Segment [Member] | Refined Products Transportation Services [Member]
Organization and Description of Business [Line Items]
Pipeline Length | mi		9,700
Refined Products Segment [Member] | Ammonia Transportation Services [Member]
Organization and Description of Business [Line Items]
Pipeline Length | mi		1,100
Crude Oil Pipeline and Terminals Segment [Member]
Organization and Description of Business [Line Items]
Pipeline Length | mi		2,200
Storage Capacity		33
Contracted Storage		21
Pipeline, Length - Wholly Owned | mi		1,000
Storage Capacity - Wholly Owned		28
Contracted Storage - Wholly Owned		19
Marine Storage Segment [Member]
Organization and Description of Business [Line Items]
Number of Independent Terminals | Terminal		6
Storage Capacity		27
Storage Capacity - Wholly Owned		25
Number of Independent Terminals - Wholly Owned | Terminal		5
Accounting Standards Update 2016-02 [Member] | Assets, Total [Member]
Organization and Description of Business [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $	$ 172
Accounting Standards Update 2016-02 [Member] | Liabilities, Total [Member]
Organization and Description of Business [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $	$ 172

Revenue from Contract with Cu_3

Revenue from Contract with Customers (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Deferred Revenue, Revenue Recognized	$ 70.2

Revenue from Contract with Cu_4

Revenue from Contract with Customers ( Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 628,935	$ 678,779
Operating Leases, Income Statement, Lease Revenue		19,462
Operating Lease, Lease Income	24,225
Unrealized Gain (Loss) on Derivatives	54,511	7,375
Affiliate management fee revenue	(5,148)	(5,250)
Revenue from Contract with Customer, Including Assessed Tax	654,073	661,442
Service [Member]
Disaggregation of Revenue [Line Items]
Revenue	460,792	431,937
Product [Member]
Disaggregation of Revenue [Line Items]
Revenue	162,995	241,592
Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,148	5,250
Operating Segments [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	422,573	493,465
Operating Leases, Income Statement, Lease Revenue		3,109
Operating Lease, Lease Income	3,245
Unrealized Gain (Loss) on Derivatives	52,109	5,465
Affiliate management fee revenue	(412)	(297)
Revenue from Contract with Customer, Including Assessed Tax	471,025	495,524
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	156,807	136,713
Operating Leases, Income Statement, Lease Revenue		12,110
Operating Lease, Lease Income	16,865
Unrealized Gain (Loss) on Derivatives	2,402	1,910
Affiliate management fee revenue	(3,486)	(4,016)
Revenue from Contract with Customer, Including Assessed Tax	138,858	122,497
Operating Segments [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	50,493	49,516
Operating Leases, Income Statement, Lease Revenue		4,243
Operating Lease, Lease Income	4,115
Unrealized Gain (Loss) on Derivatives	0	0
Affiliate management fee revenue	(1,250)	(937)
Revenue from Contract with Customer, Including Assessed Tax	45,128	44,336
Operating Segments [Member] | Service [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	267,005	260,394
Operating Segments [Member] | Service [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	147,608	126,258
Operating Segments [Member] | Service [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	47,117	46,200
Operating Segments [Member] | Product [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	155,156	232,774
Operating Segments [Member] | Product [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,713	6,439
Operating Segments [Member] | Product [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,126	2,379
Operating Segments [Member] | Product and Service, Other [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	412	297
Operating Segments [Member] | Product and Service, Other [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,486	4,016
Operating Segments [Member] | Product and Service, Other [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,250	937
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenue	(938)	(915)
Operating Leases, Income Statement, Lease Revenue		0
Operating Lease, Lease Income	0
Unrealized Gain (Loss) on Derivatives	0	0
Affiliate management fee revenue	0	0
Revenue from Contract with Customer, Including Assessed Tax	(938)	(915)
Intersegment Eliminations [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue	(938)	(915)
Intersegment Eliminations [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Eliminations [Member] | Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Transferred over Time [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue	460,792	431,937
Transferred over Time [Member] | Transportation [Member]
Disaggregation of Revenue [Line Items]
Revenue	256,185	246,025
Transferred over Time [Member] | Terminalling [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,543	40,060
Transferred over Time [Member] | Storage [Member]
Disaggregation of Revenue [Line Items]
Revenue	95,037	88,533
Transferred over Time [Member] | Ancillary Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	38,802	37,857
Transferred over Time [Member] | Lease Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	24,225	19,462
Transferred over Time [Member] | Operating Segments [Member] | Service [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	267,005	260,394
Transferred over Time [Member] | Operating Segments [Member] | Service [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	147,608	126,258
Transferred over Time [Member] | Operating Segments [Member] | Service [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	47,117	46,200
Transferred over Time [Member] | Operating Segments [Member] | Transportation [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	171,027	166,902
Transferred over Time [Member] | Operating Segments [Member] | Transportation [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	85,158	79,123
Transferred over Time [Member] | Operating Segments [Member] | Transportation [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Transferred over Time [Member] | Operating Segments [Member] | Terminalling [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,398	39,348
Transferred over Time [Member] | Operating Segments [Member] | Terminalling [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,246	0
Transferred over Time [Member] | Operating Segments [Member] | Terminalling [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	899	712
Transferred over Time [Member] | Operating Segments [Member] | Storage [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	26,439	25,247
Transferred over Time [Member] | Operating Segments [Member] | Storage [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,318	29,990
Transferred over Time [Member] | Operating Segments [Member] | Storage [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	35,218	34,211
Transferred over Time [Member] | Operating Segments [Member] | Ancillary Services [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,896	25,788
Transferred over Time [Member] | Operating Segments [Member] | Ancillary Services [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,021	5,035
Transferred over Time [Member] | Operating Segments [Member] | Ancillary Services [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,885	7,034
Transferred over Time [Member] | Operating Segments [Member] | Lease Revenue [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,245	3,109
Transferred over Time [Member] | Operating Segments [Member] | Lease Revenue [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,865	12,110
Transferred over Time [Member] | Operating Segments [Member] | Lease Revenue [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,115	4,243
Transferred over Time [Member] | Intersegment Eliminations [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue	(938)	(915)
Transferred over Time [Member] | Intersegment Eliminations [Member] | Transportation [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Transferred over Time [Member] | Intersegment Eliminations [Member] | Terminalling [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Transferred over Time [Member] | Intersegment Eliminations [Member] | Storage [Member]
Disaggregation of Revenue [Line Items]
Revenue	(938)	(915)
Transferred over Time [Member] | Intersegment Eliminations [Member] | Ancillary Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Transferred over Time [Member] | Intersegment Eliminations [Member] | Lease Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue	162,995	241,592
Transferred at Point in Time [Member] | Operating Segments [Member] | Product [Member] | Refined Products Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	155,156	232,774
Transferred at Point in Time [Member] | Operating Segments [Member] | Product [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,713	6,439
Transferred at Point in Time [Member] | Operating Segments [Member] | Product [Member] | Marine Storage Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,126	2,379
Transferred at Point in Time [Member] | Intersegment Eliminations [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0

Revenue from Contract with Cu_5

Revenue from Contract with Customers (Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Billed Contracts Receivable	$ 130,257	$ 102,684
Contract with Customer, Asset, Net	8,618	8,487
Contract with Customer, Liability	$ 124,439	$ 122,129

Revenue from Contract with Cu_6

Revenue from Contract with Customers (Performance Obligations) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3,592,238
Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	2,082,007
Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,270,411
Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 239,820
Minimum [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Maximum [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	19 years

Revenue from Contract with Cu_7

Revenue from Contract with Customers (Performance Obligations in Next 12 Months) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3,592,238
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 732,310
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,082,007
Refined Products Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	289,218
Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,270,411
Crude Oil Pipeline and Terminals Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	327,365
Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	239,820
Marine Storage Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 115,727
Minimum [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Minimum [Member] | Crude Oil Pipeline and Terminals Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Minimum [Member] | Marine Storage Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Maximum [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	19 years
Maximum [Member] | Crude Oil Pipeline and Terminals Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	10 years
Maximum [Member] | Marine Storage Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years

Segment Disclosures (Schedule O

Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 628,935	$ 678,779
Operating expenses	146,025	143,296
Cost of product sales	169,094	199,592
Other income	6,941	0
Earnings of non-controlled entities	(31,255)	(34,538)
Operating margin	352,012	370,429
Depreciation, amortization and impairment	61,871	51,879
G&A expense	45,995	46,556
Operating profit	244,146	271,994
Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	422,573	493,465
Operating expenses	89,678	94,049
Cost of product sales	160,154	190,333
Other income	614
Earnings of non-controlled entities	1,430	(2,318)
Operating margin	171,925	211,401
Depreciation, amortization and impairment	35,534	28,907
G&A expense	27,715	28,887
Operating profit	108,676	153,607
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	156,807	136,713
Operating expenses	43,823	33,591
Cost of product sales	6,664	7,050
Other income	1,573
Earnings of non-controlled entities	(32,302)	(31,608)
Operating margin	140,195	127,680
Depreciation, amortization and impairment	15,259	12,762
G&A expense	12,615	11,906
Operating profit	112,321	103,012
Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	50,493	49,516
Operating expenses	14,897	17,964
Cost of product sales	2,276	2,209
Other income	4,754
Earnings of non-controlled entities	(383)	(612)
Operating margin	38,457	29,955
Depreciation, amortization and impairment	9,643	8,817
G&A expense	5,665	5,763
Operating profit	23,149	15,375
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(938)	(915)
Operating expenses	(2,373)	(2,308)
Cost of product sales	0	0
Other income	0
Earnings of non-controlled entities	0	0
Operating margin	1,435	1,393
Depreciation, amortization and impairment	1,435	1,393
G&A expense	0	0
Operating profit	0	0
Service [Member]
Segment Reporting Information [Line Items]
Revenues	460,792	431,937
Service [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	267,005	260,394
Service [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	147,608	126,258
Service [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	47,117	46,200
Service [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(938)	(915)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	162,995	241,592
Product [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	155,156	232,774
Product [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	5,713	6,439
Product [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,126	2,379
Product [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Product and Service, Other [Member]
Segment Reporting Information [Line Items]
Revenues	5,148	5,250
Product and Service, Other [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	412	297
Product and Service, Other [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	3,486	4,016
Product and Service, Other [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,250	937
Product and Service, Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0

Investments in Non-Controlled_3

Investments in Non-Controlled Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Revenues	$ 628,935	$ 678,779
Operating	146,025	143,296
Trade accounts receivable	134,120		$ 104,164
Other accounts receivable	31,937		25,007
Long-term receivables	20,646		20,844
Change in Equity Method Investments [Roll Forward]
Investments at December 31, 2018	1,076,306
Additional investment	76,634
Indemnification settlement	(5,000)
Proportionate share of earnings	31,719
Amortization of excess investment and capitalized interest	(464)
Earnings of non-controlled entities	31,255	34,538
Distributions from operations of non-controlled entities	43,069	51,754
Distributions from returns of investments in non-controlled entities	7,500	0
Investments at March 31, 2019	1,128,626
Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	460,792	431,937
Product [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	162,995	241,592
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 1,500	500
BridgeTex [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	30.00%
BridgeTex [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Trade accounts receivable	$ 284		318
Other accounts receivable	779		1,549
Accounts Payable, Other, Current	179
BridgeTex [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 10,145	9,864
Double Eagle Pipeline Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Trade accounts receivable	$ 583		546
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 1,659	1,544
HoustonLink Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%
MVP Terminalling, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%
MVP Terminalling, LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Other accounts receivable	$ 361		397
Powder Springs Logistics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%
Powder Springs Logistics, LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Other accounts receivable	$ 269
Long-term receivables	2,725		2,221
Powder Springs Logistics, LLC [Member] | Equity Method Investee [Member] | Product [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 0	2,719
Saddlehorn Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	40.00%
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Other accounts receivable	$ 109		183
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 552	538
Seabrook Logistics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%
Seabrook Logistics, LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Operating	$ 6,909	$ 0
Accounts Payable, Other, Current	$ 1,646		$ 1,140
Texas Frontera Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%
Texas Frontera Llc [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Accounts Payable, Other, Current	$ 83

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Refined products	$ 80,437	$ 92,751
Liquefied petroleum gases	52,725	46,612
Transmix	35,947	28,497
Crude oil	19,557	11,220
Additives	6,382	6,655
Total inventory	$ 195,048	$ 185,735

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Leases [Abstract]
Operating Leases, Rent Expense, Net		$ 9,000
Operating Lease, Variable Lease Income	$ 13,700
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	7,808,952		$ 7,628,592
Other Energy Equipment [Member] | Property Subject to Operating Lease [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	229,600
Containers [Member] | Property Subject to Operating Lease [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	74,500
Pipelines [Member] | Property Subject to Operating Lease [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	44,300
Property, Plant and Equipment, Other Types [Member] | Property Subject to Operating Lease [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 27,900

Lessee, Future Minimum Payments

Lessee, Future Minimum Payments (Details) $ in Thousands	Mar. 31, 2019USD ($)
Related Party Transaction [Line Items]
2019	$ 24,155
2020	29,969
2021	28,362
2022	25,480
2023	25,031
Thereafter	67,338
Total future minimum rental payments	200,335
Present value discount	28,468
Total operating lease liability	171,867
Third Party Leases
Related Party Transaction [Line Items]
2019	15,889
2020	18,948
2021	18,994
2022	18,868
2023	18,419
Thereafter	29,867
Total future minimum rental payments	120,985
Present value discount	14,691
Total operating lease liability	106,294
Related Party Leases | Equity Method Investee [Member] | Seabrook Logistics, LLC [Member]
Related Party Transaction [Line Items]
2019	8,266
2020	11,021
2021	9,368
2022	6,612
2023	6,612
Thereafter	37,471
Total future minimum rental payments	79,350
Present value discount	13,777
Total operating lease liability	$ 65,573

Leases Operating Lease, Other D

Leases Operating Lease, Other Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Current lease liability	$ 23,264	$ 0
Long-term lease liability	148,603	0
Right-of-use asset	172,105	$ 0
Fixed lease cost	7,576
Short-term lease cost	457
Variable lease cost	371
Total lease cost	8,404
Operating cash flows from operating leases	$ 5,981
Weighted average remaining lease term (years)	8 years
Weighted-average discount rate	4.20%
Third Party Leases
Related Party Transaction [Line Items]
Current lease liability	$ 14,828
Long-term lease liability	91,466
Right-of-use asset	106,532
Fixed lease cost	4,821
Short-term lease cost	457
Variable lease cost	371
Total lease cost	5,649
Operating cash flows from operating leases	$ 3,226
Weighted average remaining lease term (years)	7 years
Weighted-average discount rate	4.10%
Seabrook Logistics, LLC [Member] | Equity Method Investee [Member] | Related Party Leases
Related Party Transaction [Line Items]
Current lease liability	$ 8,436
Long-term lease liability	57,137
Right-of-use asset	65,573
Fixed lease cost	2,755
Short-term lease cost	0
Variable lease cost	0
Total lease cost	2,755
Operating cash flows from operating leases	$ 2,755
Weighted average remaining lease term (years)	9 years
Weighted-average discount rate	4.30%

Leases Lessor, Future Minimum R

Leases Lessor, Future Minimum Rentals (Details) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
2019	$ 30,892
2020	33,770
2021	33,583
2022	23,486
2023	7,699
Thereafter	16,019
Total	$ 145,449

Leases Direct Financing Lease (

Leases Direct Financing Lease (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Total minimum lease payments receivable	$ 17,031	$ 17,468
Less: Unearned income	3,265	3,422
Recorded net investment in sales-type lease	13,766	14,046
Other accounts receivable	1,151	1,138
Long-term receivables	12,615	12,908
Total	13,766	$ 14,046
2019	1,300
2020	1,700
2021	1,700
2022	1,700
2023	1,700
Thereafter	$ 8,700

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)pension_plan	Mar. 31, 2018USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Cost	$ 4.1	$ 3.8
Number Of Company Sponsored Union Pension Plans | pension_plan	2
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 32.1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0.2

Schedule Of Consolidated Net Pe

Schedule Of Consolidated Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Plan [Member]
Components of net periodic benefit costs:
Service cost	$ 6,527	$ 15,700
Interest cost	3,000	6,443
Expected return on plan assets	(2,374)	(2,978)
Amortization of prior service credit	(45)	(45)
Amortization of actuarial loss	1,277	4,954
Net periodic benefit cost	8,385	24,074
Other Postretirement Benefits Plan [Member]
Components of net periodic benefit costs:
Service cost	54	65
Interest cost	119	106
Expected return on plan assets	0	0
Amortization of prior service credit	0	0
Amortization of actuarial loss	71	160
Net periodic benefit cost	$ 244	$ 331

Employee Benefit Plans Schedule

Employee Benefit Plans Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Changes in AOCL [Roll Forward]
Accumulated other comprehensive loss (Beginning Bal)	$ (120,491)
Net actuarial loss	0	$ (5,944)
Amortization of prior service credit	(45)	(45)
Amortization of actuarial loss	1,348	5,114
Accumulated other comprehensive loss (Ending Bal)	(122,937)
Pension Plan [Member]
Changes in AOCL [Roll Forward]
Accumulated other comprehensive loss (Beginning Bal)	(88,602)	(97,226)
Net actuarial loss	0	(5,944)
Amortization of prior service credit	(45)	(45)
Amortization of actuarial loss	1,277	4,954
Accumulated other comprehensive loss (Ending Bal)	(87,370)	(98,261)
Other Postretirement Benefits Plan [Member]
Changes in AOCL [Roll Forward]
Accumulated other comprehensive loss (Beginning Bal)	(5,409)	(6,597)
Net actuarial loss	0	0
Amortization of prior service credit	0	0
Amortization of actuarial loss	71	160
Accumulated other comprehensive loss (Ending Bal)	$ (5,338)	$ (6,437)

Debt (Consolidated Debt) (Detai

Debt (Consolidated Debt) (Details) - USD ($)	Mar. 31, 2019	Feb. 11, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 4,319,000,000		$ 4,300,000,000
Unamortized debt issuance costs	(31,671,000)		(27,070,000)
Net unamortized premium (discount)	(7,653,000)		(2,927,000)
Net unamortized amount of gains from historical fair value hedges	0		866,000
Long-term Debt	4,279,676,000		4,270,869,000
Current portion of long-term debt, net	0		59,489,000
Long-term debt, net	4,279,676,000		4,211,380,000
6.55% Notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 0	$ 550,000,000	550,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.55%	6.55%
4.25% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 550,000,000		550,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%
3.20% Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250,000,000		250,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.20%
5.00% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 650,000,000		650,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%
6.40% Notes Due 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250,000,000		250,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.40%
4.20% Notes Due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250,000,000		250,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.20%
5.15% Notes Due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 550,000,000		550,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.15%
4.20% Notes Due 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250,000,000		250,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.20%
4.25% Notes Due 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000		500,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%
4.20% Notes Due 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000		500,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.20%
4.85% Notes Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000		0
Debt Instrument, Interest Rate, Stated Percentage	4.85%
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 69,000,000		$ 0

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Feb. 11, 2019
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 4,319,000,000		$ 4,300,000,000
Payment for Debt Extinguishment or Debt Prepayment Cost	8,270,000	$ 0
Borrowings under long-term notes	496,855,000	$ 0
Long term debt	4,279,676,000		4,270,869,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000,000
Unused commitment fee	0.125%
Long term debt	$ 0		0
Obligation for letters of credit	$ 3,500,000		6,800,000
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Unused commitment fee	0.10%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.625%
Unused commitment fee	0.275%
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 69,000,000		$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000,000
Long-term Debt, Weighted Average Interest Rate, over Time	2.80%		2.30%
Commercial Paper [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	397 days
4.85% Notes Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000		$ 0
Debt Instrument, Interest Rate, Stated Percentage	4.85%
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 8,300,000
Debt Instrument, Notes At Price	99.371%
Borrowings under long-term notes	$ 491,500,000
6.55% Notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 0		$ 550,000,000	$ 550,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.55%			6.55%

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative [Line Items]
Good Faith and Margin Deposits with Broker-Dealers	$ 23,820,000		$ 0
Debt Instrument, Face Amount	4,319,000,000		4,300,000,000
Net receipt on financial derivatives	8,028,000	$ 0
Energy commodity derivatives deposits	0		37,328,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(2,400,000)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	100,000,000
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	(4,500,000)
4.85% Notes Due 2049 [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	$ 500,000,000		$ 0
Debt Instrument, Interest Rate, Stated Percentage	4.85%
4.85% Notes Due 2049 [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 150,000,000
Net receipt on financial derivatives	$ (8,000,000)

Derivative Financial Instrume_4

Derivative Financial Instruments (Schedule Of NYMEX Contracts And Butane Price Swap Purchase Agreements) (Details) bbl in Millions	Mar. 31, 2019bbl
Economic Hedges [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	3.3
Economic Hedges Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0.6

Derivative Financial Instrume_5

Derivative Financial Instruments (Schedule of Derivative Offset Amounts) (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Energy commodity derivatives deposits		$ 23,820	$ 0
Exchange Traded [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		597	62,166
Derivative Liability, Fair Value, Gross Liability		(13,869)	(7,155)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral			55,011
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		13,272
Derivative, Collateral, Right to Reclaim Cash			(37,328)
Energy commodity derivatives deposits		23,820
Amount After Offset	[1]	$ 10,548	$ 17,683
[1]	Amount represents the maximum loss we would incur if all of our counterparties failed to perform on their derivative contracts.

Derivative Financial Instrume_6

Derivative Financial Instruments (Derivative Gains Included In Accumulated Other Comprehensive Loss (AOCL) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Gains Included in AOCI [Roll Forward]
Beginning balance	$ (26,480)	$ (33,755)
Net gain (loss) on cash flow hedges	(4,376)	5,414
Reclassification of net loss (gain) on cash flow hedges to income	627	740
Ending balance	$ (30,229)	$ (27,601)

Derivative Financial Instrume_7

Derivative Financial Instruments (Derivatives And Hedging-Cash Flow Hedges) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on cash flow hedges	$ (4,376)	$ 5,414
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on cash flow hedges	(4,376)	5,414
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (627)	$ (740)

Derivative Financial Instrume_8

Derivative Financial Instruments (Derivatives And Hedging-Overall-Subsequent Measurement) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (52,238)	$ (11,319)
Commodity Contract [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(54,511)	(7,375)
Commodity Contract [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 2,273	$ (3,944)

Derivative Financial Instrume_9

Derivative Financial Instruments (Derivatives and Hedging - Designated) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 774
Derivative Liability, Fair Value, Gross Liability		8,438
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		462
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0	312
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	4,474	8,438
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	597	61,704
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 13,869	$ 7,155

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2018
Loss Contingencies [Line Items]
Liabilities recognized for estimated environmental costs	$ 18,600		$ 20,500
Environmental expenses	2,000	$ 2,500
Receivables from insurance carriers related to environmental matters	4,000		4,100
Gain (Loss) on Disposition of Other Assets	21,788	$ 0
Accounts Receivable [Member]
Loss Contingencies [Line Items]
Receivables from insurance carriers related to environmental matters	2,400		2,400
Other Noncurrent Assets [Member]
Loss Contingencies [Line Items]
Receivables from insurance carriers related to environmental matters	$ 1,600		$ 1,700
BridgeTex [Member]
Loss Contingencies [Line Items]
Interest in equity method investment	30.00%
Gain (Loss) on Disposition of Other Assets	$ 11,000
BridgeTex [Member] | Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Guarantees, Fair Value Disclosure	$ 5,000			$ 16,000
Powder Springs Logistics, LLC [Member]
Loss Contingencies [Line Items]
Interest in equity method investment	50.00%
Powder Springs Logistics, LLC [Member] | Guarantee of Indebtedness of Others [Member] | Equity Method Investee [Member]
Loss Contingencies [Line Items]
Interest in equity method investment	50.00%
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 25,000
Guarantees, Fair Value Disclosure	$ 400

Long-Term Incentive Plan (Narra

Long-Term Incentive Plan (Narrative) (Details) - shares	Feb. 01, 2019	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Limited partners' capital account, units authorized for issuance (in shares)		11,900,000
Limited partner unitholders, units remaining available (in shares)		1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	347,473
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years

Long-Term Incentive Plan (Equit

Long-Term Incentive Plan (Equity-Based Incentive Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Allocation of LTIP expense on consolidated statements of income	$ 4,914	$ 6,632
G&A Expense [Member]
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Allocation of LTIP expense on consolidated statements of income	4,871	6,577
Operating Expenses [Member]
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Allocation of LTIP expense on consolidated statements of income	43	55
Performance Based Awards [Member]
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Allocation of LTIP expense on consolidated statements of income	3,644	5,924
Time-Based Awards [Member]
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Allocation of LTIP expense on consolidated statements of income	$ 1,270	$ 708

Partners' Capital and Distrib_3

Partners' Capital and Distributions (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Partners' Capital [Abstract]
Amount Authorized Under Equity Distribution Agreement	$ 750

Partners' Capital and Distrib_4

Partners' Capital and Distributions (Schedule of Capital Units) (Details)	3 Months Ended
	Mar. 31, 2019shares
Increase (Decrease) in Partners' Capital [Roll Forward]
Limited partner units outstanding on January 1, 2018 (in shares)	228,195,160
Limited partner units outstanding on March 31, 2018 (in shares)	228,403,428
Management [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
During 2019–Other (in shares)	199,792
Director [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
During 2019–Other (in shares)	8,476

Partners' Capital and Distrib_5

Partners' Capital and Distributions (Schedule Of Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands	May 15, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Jun. 30, 2019	Dec. 31, 2018
Distribution Made to Limited Partner [Line Items]
Cash distribution per unit (in dollars per share)		$ 0.9975	$ 0.9775	$ 0.9575	$ 0.9375	$ 0.9200		$ 3.7925
Total Cash Distribution to Limited Partners		$ 227,832	$ 223,061	$ 218,497	$ 213,933	$ 209,940		$ 865,431
Scenario, Forecast
Distribution Made to Limited Partner [Line Items]
Cash distribution per unit (in dollars per share)	$ 1.0050						$ 2.0025
Total Cash Distribution to Limited Partners	$ 229,545						$ 457,377

Fair Value (Schedule Of Carryin

Fair Value (Schedule Of Carrying Amounts And Fair Values Of Financial Assets/Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	$ (13,272)
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	(4,449,954)	$ (4,224,373)
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	(4,474)	(8,126)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	20,646	20,844
Guarantees, Fair Value Disclosure	(408)	(16,409)
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	20,646	20,844
Guarantees, Fair Value Disclosure	(408)	(16,409)
Debt	(4,279,676)	(4,270,869)
Reported Value Measurement [Member] | Commodity Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		55,011
Derivative Liability	(13,272)
Reported Value Measurement [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	(4,474)	(8,126)
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	20,646	20,844
Guarantees, Fair Value Disclosure	(408)	(16,409)
Debt	(4,449,954)	(4,224,373)
Estimate of Fair Value Measurement [Member] | Commodity Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		55,011
Derivative Liability	(13,272)
Estimate of Fair Value Measurement [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	$ (4,474)	(8,126)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		$ 55,011

Related Party Transactions (Det

Related Party Transactions (Details) - Director [Member] - Methvin Company [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 7.3	$ 3.8
Accounts Receivable, Related Parties, Current	$ 2.6		$ 1.9

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	May 15, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Jun. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Cash distribution per unit (in dollars per share)		$ 0.9975	$ 0.9775	$ 0.9575	$ 0.9375	$ 0.9200		$ 3.7925
Total cash distributions		$ 227,832	$ 223,061	$ 218,497	$ 213,933	$ 209,940		$ 865,431
Scenario, Forecast
Subsequent Event [Line Items]
Cash distribution per unit (in dollars per share)	$ 1.0050						$ 2.0025
Total cash distributions	$ 229,545						$ 457,377

Uncategorized Items - mmp-20190

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 5,975,000
Limited Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 5,975,000