Tallgrass Energy 10-Q 2 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 02, 2017
Document Information [Line Items]
Entity Registrant Name	TALLGRASS ENERGY GP, LP
Entity Central Index Key	1,633,651
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Trading Symbol	TEGP
Amendment Flag	false
Capital Unit, Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		58,075,000
Capital Unit, Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		99,154,440

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 873	$ 2,459
Accounts receivable, net	58,157	59,536
Gas imbalances	650	1,597
Inventories	11,241	13,093
Derivative assets	220	10,967
Prepayments and other current assets	7,153	7,628
Total Current Assets	78,294	95,280
Property, plant and equipment, net	2,232,754	2,079,232
Goodwill	343,288	343,288
Intangible asset, net	93,258	93,522
Unconsolidated investments	936,939	475,625
Deferred tax asset	509,114	521,454
Deferred financing costs, net	14,179	6,042
Deferred charges and other assets	11,362	11,037
Total Assets	4,219,188	3,625,480
Current Liabilities:
Accounts payable	24,227	24,449
Accounts payable to related parties	5,778	5,824
Gas imbalances	1,281	1,239
Derivative liabilities	0	556
Accrued taxes	17,246	16,996
Accrued liabilities	18,662	16,755
Deferred revenue	85,566	60,757
Other current liabilities	5,292	6,446
Total Current Liabilities	158,052	133,022
Long-term debt, net	2,234,568	1,555,981
Other long-term liabilities and deferred credits	17,200	7,063
Total Long-term Liabilities	2,251,768	1,563,044
Commitments and Contingencies
Equity [Abstract]
Total Partners' Equity	237,224	333,262
Noncontrolling interests	1,572,144	1,596,152
Total Equity	1,809,368	1,929,414
Total Liabilities and Equity	4,219,188	3,625,480
Common Class A
Equity [Abstract]
Total Partners' Equity	237,224	250,967
Common Class B
Equity [Abstract]
Total Partners' Equity	0	0
Predecessor
Equity [Abstract]
Total Partners' Equity	$ 0	$ 82,295

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - shares	Jun. 30, 2017	Dec. 31, 2016
Common Class A
Limited Partners' Capital Account, Units Issued	58,075,000	58,075,000
Shares Outstanding	58,075,000	58,075,000
Common Class B
Limited Partners' Capital Account, Units Issued	99,154,440	99,154,440
Shares Outstanding	99,154,440	99,154,440

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Crude oil transportation services	$ 89,855	$ 93,322	$ 174,186	$ 187,894
Natural gas transportation services	29,429	28,682	61,114	57,962
Sales of natural gas, NGLs, and crude oil	22,918	16,830	38,299	30,756
Processing and other revenues	18,661	10,181	31,664	19,571
Total Revenues	160,863	149,015	305,263	296,183
Operating Costs and Expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	19,386	15,958	31,756	29,526
Cost of transportation services (exclusive of depreciation and amortization shown below)	14,758	11,575	28,261	25,104
Operations and maintenance	15,254	14,270	28,157	27,228
Depreciation and amortization	22,091	21,890	43,494	43,897
General and administrative	15,334	14,871	29,551	28,882
Taxes, other than income taxes	6,912	5,783	15,138	13,433
Contract termination	0	8,061	0	8,061
Loss (gain) on disposal of assets	184	1,849	(1,264)	1,849
Total Operating Costs and Expenses	93,919	94,257	175,093	177,980
Operating Income	66,944	54,758	130,170	118,203
Other Income (Expense):
Interest expense, net	(21,114)	(10,441)	(37,131)	(19,118)
Unrealized gain on derivative instrument	0	18,953	1,885	10,007
Equity in earnings of unconsolidated investments	42,741	24,022	63,479	24,731
Other income, net	272	221	342	787
Total Other Income (Expense)	21,899	32,755	28,575	16,407
Net income before tax	88,843	87,513	158,745	134,610
Deferred income tax expense	(9,676)	(6,792)	(12,340)	(9,583)
Net income	79,167	80,721	146,405	125,027
Net income attributable to noncontrolling interests	(70,414)	(81,161)	(125,623)	(114,193)
Net income (loss) attributable to TEGP	8,753	(440)	20,782	10,834
Predecessor operations interest in net loss	0	3,888	0	203
Net income attributable to TEGP, excluding predecessor operations interest	$ 8,753	$ 3,448	$ 20,782	$ 11,037
Earnings Per Share, Basic and Diluted [Abstract]
Basic net income per Class A share	$ (0.15)	$ (0.07)	$ (0.36)	$ (0.23)
Diluted net income per Class A share	$ 0.15	$ 0.07	$ 0.36	$ 0.23
Basic average number of Class A shares outstanding	58,075	47,725	58,075	47,725
Diluted average number of Class A shares outstanding	58,192	47,734	58,187	47,725

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Pony Express Pipeline	Noncontrolling Interest	Noncontrolling InterestTallgrass Energy Partners	Noncontrolling InterestTerminals and NatGas	Noncontrolling InterestRockies Express Pipeline LLC	Noncontrolling InterestPony Express Pipeline	Total Partner Equity Including Portion Attributable to Noncontrolling Interest	Total Partner Equity Including Portion Attributable to Noncontrolling InterestTallgrass Energy Partners	Total Partner Equity Including Portion Attributable to Noncontrolling InterestTerminals and NatGas	Total Partner Equity Including Portion Attributable to Noncontrolling InterestRockies Express Pipeline LLC	Total Partner Equity Including Portion Attributable to Noncontrolling InterestPony Express Pipeline	Common Class A	Common Class ATallgrass Energy Partners	Common Class ATerminals and NatGas	Common Class ARockies Express Pipeline LLC	Common Class APony Express Pipeline	Common Class B	Common Class BTallgrass Energy Partners	Common Class BTerminals and NatGas	Common Class BRockies Express Pipeline LLC	Common Class BPony Express Pipeline	Predecessor Equity	Predecessor EquityTallgrass Energy Partners	Predecessor EquityTerminals and NatGas	Predecessor EquityRockies Express Pipeline LLC	Predecessor EquityPony Express Pipeline
Partners' Capital, Including Portion Attributable to Noncontrolling Interest			$ 1,599,188					$ 2,093,062					$ 422,310					$ 0					$ 71,564
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 125,027		114,193					125,027					11,037					0					(203)
Issuance of TEP units to public, net of offering costs				$ 239,611					$ 261,770					$ 22,159					$ 0					$ 0
Proceeds from private placement of TEP common units, net of offering costs	90,009			82,417					90,009					7,592					0					0
TEGP distributions to Class A shareholders	(18,278)		0					(18,278)					(18,278)					0					0
Noncash compensation expense			3,820					4,462					642					0					0
Payments for Repurchase of Common Stock	0
Acquisitions							$ (173,422)					$ (429,039)					$ (255,617)					$ 0					$ 0
Contributions from noncontrolling interest			(7,300)					(7,273)					0					0					0
Distributions to noncontrolling interest	(109,551)	$ (425,882)	(109,600)					(109,551)					0					0					0
Distributions to Predecessor Entities, net			0					(2,530)					0					0					(2,530)
Cost associated with equity issuance			0					(489)					(489)					0					0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest			1,763,529					2,021,716					189,356					0					68,831
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	1,929,414		1,596,152					1,929,414					250,967					0					82,295
Net income	146,405		125,623					146,405					20,782					0					0
Issuance of TEP units to public, net of offering costs	112,800			101,375					112,762					11,387					0					0
Proceeds from private placement of TEP common units, net of offering costs	0
TEGP distributions to Class A shareholders	(32,813)		0					(32,813)					32,813					0					0
Noncash compensation expense			3,647					4,410					763					0					0
TEP LTIP units tendered by employees to satisfy tax withholding obligations				$ 11,023					$ (12,273)					$ 1,250					$ 0					$ 0
Partial exercise of call option			(72,890)					(84,942)					(12,052)					0					0
Payments for Repurchase of Common Stock	(35,335)		31,717					35,335					3,618					0					0
Acquisitions					$ (36,391)	$ 40,159				$ (140,000)	$ 63,681				$ (21,314)	$ 23,522				$ 0	$ 0				$ (82,295)	$ 0
Contributions from TD			1,451					2,301					850					0					0
Contributions from noncontrolling interest			(900)					(867)					0					0					0
Distributions to noncontrolling interest	(145,109)	$ 0	145,100					(145,109)					0					0					0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	$ 1,809,368		$ 1,572,144					$ 1,809,368					$ 237,224					$ 0					$ 0

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 146,405	$ 125,027
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	47,939	47,302
Equity in earnings of unconsolidated investments	(63,479)	(24,731)
Distributions from unconsolidated investments	63,374	24,636
Deferred income tax expense	12,340	9,583
Noncash change in the fair value of derivative financial instruments
Accounts receivable and other	2,067	6,391
Accounts payable and accrued liabilities	3,150	6,059
Deferred revenue	24,593	16,174
Other current assets and liabilities	2,241	(3,755)
Other operating, net	(660)	(4,155)
Net Cash Provided by Operating Activities	237,970	202,531
Cash Flows from Investing Activities:
Acquisition of Rockies Express membership interest	(400,000)	(436,022)
Acquisition of Terminals and NatGas	(140,000)	0
Acquisition of Douglas Gathering System	128,526	0
Capital expenditures	(53,995)	(34,860)
Distributions from unconsolidated investments in excess of cumulative earnings	27,308	6,335
Contributions to unconsolidated investments	(17,835)	(14,450)
Acquisition of Pony Express membership interest	0	(49,118)
Other investing, net	(13,986)	411
Net Cash Used in Investing Activities	(727,034)	(527,704)
Net Cash Provided by Financing Activities
Proceeds from issuance of long-term debt	350,000	0
Borrowings under revolving credit facilities, net	332,000	525,000
Distributions to noncontrolling interests	(145,109)	(109,551)
Proceeds from public offering of TEP common units, net of offering costs	112,762	261,770
Payments for Repurchase of Common Stock	(35,335)	0
TEGP distributions to Class A shareholders	(32,813)	(18,278)
Proceeds from private placement of TEP common units, net of offering costs	0	90,009
Other financing, net	(21,646)	2,494
Net Cash Provided by Financing Activities	487,478	325,562
Net Change in Cash and Cash Equivalents
Net Change in Cash and Cash Equivalents	(1,586)	389
Cash and Cash Equivalents, beginning of period	2,459	2,234
Cash and Cash Equivalents, end of period	873	2,623
Pony Express Pipeline
Net Cash Provided by Financing Activities
Distributions to noncontrolling interests	0	(425,882)
Equity Option
Net Cash Provided by Financing Activities
Payments for Repurchase of Common Stock	$ (72,381)	$ 0

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Tallgrass Energy GP, LP ("TEGP" or the "Partnership") is a limited partnership that has elected to be treated as a corporation for U.S. federal income tax purposes. "We," "us," "our" and similar terms refer to TEGP together with its consolidated subsidiaries. TEGP's sole cash-generating asset as of June 30, 2017 is an approximate 36.94% controlling membership interest in Tallgrass Equity. Tallgrass Equity's sole cash-generating assets consist of direct and indirect partnership interests in Tallgrass Energy Partners, LP ("TEP"), as described below, that were historically owned by entities controlled by Tallgrass Equity, including Tallgrass Development, LP ("TD"): • 100% of the outstanding membership interests in Tallgrass MLP GP, LLC ("TEP GP"), which owns the general partner interest in TEP as well as all of the TEP incentive distribution rights ("IDRs"). The general partner interest in TEP is represented by 834,391 general partner units, representing an approximate 1.13% general partner interest in TEP at June 30, 2017 . • 20,000,000 TEP common units, representing an approximate 27.08% limited partner interest in TEP at June 30, 2017 . TEP is a publicly traded, growth-oriented limited partnership formed to own, operate, acquire and develop midstream energy assets in North America. TEP's operations are located in and provide services to certain key United States hydrocarbon basins, including the Denver-Julesburg, Powder River, Wind River, Permian and Hugoton-Anadarko Basins and the Niobrara, Mississippi Lime, Eagle Ford, Bakken, Marcellus, and Utica shale formations. Our reportable business segments are: • Crude Oil Transportation & Logistics—the ownership and operation of a FERC-regulated crude oil pipeline system and crude oil storage and terminalling facilities; • Natural Gas Transportation & Logistics—the ownership and operation of FERC-regulated interstate natural gas pipelines and integrated natural gas storage facilities; and • Processing & Logistics—the ownership and operation of natural gas gathering, processing, treating and fractionation facilities, the provision of water business services primarily to the oil and gas exploration and production industry and the transportation of NGLs. Crude Oil Transportation & Logistics. TEP currently provides crude oil transportation to customers in Wyoming, Colorado, and the surrounding regions through Tallgrass Pony Express Pipeline, LLC ("Pony Express"), which owns a FERC-regulated crude oil pipeline commencing in Guernsey, Wyoming and terminating in Cushing, Oklahoma, which includes a lateral in Northeast Colorado commencing in Weld County, Colorado, and interconnecting with the pipeline just east of Sterling, Colorado (the "Pony Express System"). TEP also provides crude oil storage and terminalling services through TEP's 100% membership interest in Tallgrass Terminals, LLC ("Terminals") acquired effective January 1, 2017, which owns and operates crude oil terminals near Sterling, Colorado (the "Sterling Terminal") and in Weld County, Colorado (the "Buckingham Terminal"). Terminals also owns a 69% membership interest in Deeprock Development, LLC ("Deeprock Development"), which owns a crude oil terminal in Cushing, Oklahoma (the "Cushing Terminal"), inclusive of an additional 49% membership interest in Deeprock Development acquired in July 2017 as discussed in Note 16 – Subsequent Events . Natural Gas Transportation & Logistics. TEP provides natural gas transportation and storage services for customers in the Rocky Mountain, Midwest and Appalachian regions of the United States through: (1) its 49.99% membership interest in Rockies Express Pipeline LLC ("Rockies Express"), which owns the Rockies Express Pipeline, a FERC-regulated natural gas pipeline system extending from Opal, Wyoming and Meeker, Colorado to Clarington, Ohio (the "Rockies Express Pipeline"), inclusive of the additional 24.99% membership interest acquired from TD effective March 31, 2017 as discussed in Note 4 – Acquisitions , and TEP's 100% membership interest in Tallgrass NatGas Operator, LLC ("NatGas") acquired effective January 1, 2017, which operates the Rockies Express Pipeline, (2) the Tallgrass Interstate Gas Transmission system, a FERC-regulated natural gas transportation and storage system located in Colorado, Kansas, Missouri, Nebraska and Wyoming (the "TIGT System"), and (3) the Trailblazer Pipeline system, a FERC-regulated natural gas pipeline system extending from the Colorado and Wyoming border to Beatrice, Nebraska (the "Trailblazer Pipeline"). Processing & Logistics. TEP also provides services for customers in Wyoming through a natural gas gathering system in the Powder River Basin (the "Douglas Gathering System") that was acquired on June 5, 2017, as discussed in Note 4 – Acquisitions , and at the Casper and Douglas natural gas processing facilities and the West Frenchie Draw natural gas treating facility (collectively, the "Midstream Facilities"), and NGL transportation services in Northeast Colorado and Wyoming. TEP performs water business services, including freshwater transportation and produced water gathering and disposal, in Colorado, Texas, and Wyoming through BNN Water Solutions, LLC ("Water Solutions"). The term "Terminals Predecessor" refers to Terminals and the term "NatGas Predecessor" refers to NatGas prior to their acquisition by TEP on January 1, 2017. Terminals Predecessor and NatGas Predecessor are collectively referred to as the Predecessor Entities, as further discussed in Note 2 – Summary of Significant Accounting Policies . Financial results for all prior periods have been recast to reflect the operations of the Predecessor Entities. Predecessor Equity as presented in the condensed consolidated financial statements represents the capital account activity of Terminals Predecessor and NatGas Predecessor prior to January 1, 2017. For additional information regarding these acquisitions, see Note 4 – Acquisitions .

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Basis of Presentation These condensed consolidated financial statements and related notes for the three and six months ended June 30, 2017 and 2016 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board's Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America ("GAAP") for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP for annual periods. The condensed consolidated financial statements for the three and six months ended June 30, 2017 and 2016 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair statement of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation. Our financial results for the three and six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2017 . The accompanying condensed consolidated interim financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2016 ("2016 Form 10-K") filed with the United States Securities and Exchange Commission (the "SEC") on February 15, 2017. The condensed consolidated financial statements include the accounts of TEGP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net income or loss from consolidated subsidiaries that are not wholly-owned by TEGP is attributed to TEGP and noncontrolling interests in accordance with the respective ownership interests. As further discussed in Note 4 – Acquisitions , TEP closed the acquisition of Terminals and NatGas effective January 1, 2017. As the acquisitions of Terminals and NatGas are considered transactions between entities under common control, and a change in reporting entity, the financial information presented has been recast to include Terminals and NatGas for all periods presented. Net equity distributions of the Predecessor Entities included in the condensed consolidated financial statements represent transfers of cash as a result of TD's centralized cash management system prior to January 1, 2017 for Terminals and NatGas, under which cash balances were swept daily and recorded as loans from the subsidiaries of TD. These loans were then periodically recorded as equity distributions. The accompanying condensed consolidated financial statements of TEGP include historical cost-basis accounts of the assets and liabilities of the Predecessor Entities for the periods prior to January 1, 2017, the date TEP acquired Terminals and NatGas from TD, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis. TEGP, TEP, and the Predecessor Entities are all considered "entities under common control" as defined under GAAP and, as such, the transfers between the entities of the assets and liabilities have been recorded by TEGP at historical cost. A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity's economic performance. We have presented separately in our condensed consolidated balance sheets, to the extent material, the liabilities of our consolidated VIEs for which creditors do not have recourse to our general credit. Our consolidated VIEs do not have material assets that can only be used to settle specific obligations of the consolidated VIEs. Tallgrass Equity is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, we have determined that we are the primary beneficiary as we have the right to receive benefits of Tallgrass Equity that could potentially be significant to Tallgrass Equity. TEP is also considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis, we have determined that TEP GP is the primary beneficiary of TEP and we continue to consolidate TEP accordingly. Use of Estimates Certain amounts included in or affecting these condensed consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on our business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known. Accounting Pronouncement Recently Adopted ASU No. 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business" In January 2017, the FASB issued Accounting Standards Update ("ASU") No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses by providing a screen to determine when an integrated set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. The ASU also narrows the definition of the term "output" so that the term is consistent with how outputs are described under the revenue recognition guidance in Topic 606. The amendments in ASU 2017-01 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2017. Early adoption is permitted in certain circumstances. We elected to adopt the guidance in ASU 2017-01 effective April 1, 2017, and as a result applied the new guidance to transactions completed during the three months ended June 30, 2017 . ASU No. 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" In January 2017, the FASB issued ASU No. 2017-04, which simplifies the subsequent measurement of goodwill by eliminating "Step 2" from the goodwill impairment test, which involved calculating the implied fair value of goodwill by determining the fair value at the impairment testing date of a reporting unit's assets and liabilities. Instead, under the simplified test approach, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The amendments in ASU 2017-04 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We elected to adopt the guidance in ASU 2017-04 effective April 1, 2017, and as a result will apply the new guidance to our annual goodwill impairment tests to be performed as of August 31, 2017. ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Among other changes, ASU 2016-09 allows an entity to make an entity-wide accounting policy election to either estimate the number of awards expected to vest (consistent with current GAAP) or account for forfeitures when they occur. The amendments in ASU 2016-09 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2016. Early adoption is permitted. We adopted the guidance in ASU 2016-09 effective January 1, 2017 and made a policy election to account for forfeitures when they occur. The adoption of ASU 2016-09 did not have a material impact on our consolidated financial statements. Accounting Pronouncements Not Yet Adopted Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five-step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. Throughout 2015 and 2016, the FASB has issued a series of subsequent updates to the revenue recognition guidance in Topic 606, including ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers. The amendments in ASU 2014-09, ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 are effective for public entities for annual reporting periods beginning after December 15, 2017, and for interim periods within that reporting period. Early application is permitted for annual reporting periods beginning after December 15, 2016. We are currently evaluating the impact of our pending adoption of the revised guidance. The status of our implementation is as follows: • We have formed an implementation team that meets to discuss implementation challenges, technical interpretations, industry-specific treatment of certain revenue contract types, and project status. • We are currently reviewing contracts for each revenue stream identified within each of our business segments. Through this process, we are determining and documenting expected changes in revenue recognition upon adoption of the revised guidance. • We plan to evaluate the potential information technology and internal control changes that will be required for adoption based on the findings from our contract review process. • We plan to provide internal training and awareness related to the revised guidance to the key stakeholders throughout our organization. While we have tentatively concluded that the implementation of ASU 2014-09 will not have a material impact on our revenue recognition policies for a substantial number of our contracts, management has identified several areas of potential impact through the contract review process currently underway, including the accounting for non-cash consideration, particularly in our Crude Oil Transportation & Logistics and Processing & Logistics segments, and the timing of revenue recognition with respect to deficiency payments received in our Crude Oil Transportation & Logistics segment. We are currently working with an industry group to develop positions regarding these outstanding items. We are in the process of quantifying the impact of adoption, but we cannot reasonably estimate the full impact of the standard until the industry reaches consensus on these issues. We do anticipate significant changes to our disclosures based on the additional requirements prescribed by the standard. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is (or will be) recognized and data related to contract assets and liabilities. Additionally, we are currently evaluating our business processes, systems and controls to ensure the accuracy and timeliness of the recognition and disclosure requirements under the new revenue guidance. We will continue to conduct our contract review process throughout 2017 and, as a result, additional areas of impact may be identified. We expect to adopt the new standard on January 1, 2018 using the modified retrospective approach. This approach allows us to apply the new standard to (i) all new contracts entered into after January 1, 2018 and (ii) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to equity. Consolidated revenues presented in our comparative financial statements for periods prior to January 1, 2018 would not be revised. ASU No. 2016-02, "Leases (Topic 842)" In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU 2016-02 provides a comprehensive update to the lease accounting topic in the Codification intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in ASU 2016-02 include a revised definition of a lease as well as certain scope exceptions. The changes primarily impact lessee accounting, while lessor accounting is largely unchanged from previous GAAP. The amendments in ASU 2016-02 are effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within that reporting period. Early application is permitted. We are currently evaluating the impact of ASU 2016-02.

Variable Interest Entity Variab

Variable Interest Entity Variable Interest Entity	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	TEP is a VIE of which TEP GP, our consolidated subsidiary, is the primary beneficiary. We continue to consolidate TEP accordingly. We have not provided any additional financial support and have no contractual commitments or obligations to provide additional financial support to TEP. TEGP, as the managing member of Tallgrass Equity, has voting rights disproportionate to its ownership interest. As a result, we have determined that Tallgrass Equity is a VIE of which we are the primary beneficiary and we consolidate Tallgrass Equity accordingly. We have not provided any additional financial support to Tallgrass Equity other than our initial capital contribution to acquire a portion of our controlling interest in Tallgrass Equity and have no contractual commitments or obligations to provide additional financial support to Tallgrass Equity. Other than TEGP's deferred tax asset of approximately $509.1 million and $521.5 million at June 30, 2017 and December 31, 2016 , respectively, the assets and liabilities included in our condensed consolidated balance sheets at June 30, 2017 and December 31, 2016 represent the consolidated assets and liabilities of Tallgrass Equity, including the assets and liabilities of TEP.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions	TEP Acquisition of DCP Douglas, LLC On May 17, 2017, TEP, through its wholly-owned subsidiary Tallgrass Midstream, LLC (“TMID”), entered into a Membership Interest Purchase Agreement with DCP Assets Holding, LP to acquire 100% of the membership interests in DCP Douglas, LLC, which owns the Douglas Gathering System, a natural gas gathering system in the Powder River Basin with approximately 1,500 miles of gathering pipeline connected to TMID's Douglas processing plant, for approximately $128.5 million , subject to working capital adjustments. The acquisition closed on June 5, 2017 and has been accounted for as an asset acquisition, with substantially all of the fair value allocated to the long-lived assets acquired based on their relative fair values. TEP Acquisition of an Additional 24.99% Membership Interest in Rockies Express On March 31, 2017, TEP, TD, and Rockies Express Holdings, LLC, entered into a definitive Purchase and Sale Agreement, pursuant to which TEP acquired an additional 24.99% membership interest in Rockies Express from TD in exchange for cash consideration of $400 million . Together with the 25% membership interest in Rockies Express that TEP acquired from a unit of Sempra U.S. Gas and Power on May 6, 2016, this transaction increases TEP’s aggregate membership interest in Rockies Express to 49.99% . The transfer of the Rockies Express membership interest between TD and TEP is considered a transaction between entities under common control, but does not represent a change in reporting entity. TEP's investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. As a result of the common control nature of the transaction, the 24.99% membership interest in Rockies Express was transferred to TEP at TD's historical carrying amount, including the remaining unamortized basis difference driven by the difference between the fair value of the investment and the book value of the underlying assets and liabilities on November 13, 2012, the date of acquisition by TD. For additional information, see Note 8 – Investments in Unconsolidated Affiliates . As of March 31, 2017, the negative basis difference carried over from TD was approximately $386.8 million . The amount of the basis difference allocated to property, plant and equipment is accreted over 35 years , which equates to the 2.86% composite depreciation rate utilized by Rockies Express to depreciate the underlying property, plant and equipment. The amount allocated to long-term debt is amortized over the remaining life of the various debt facilities. The basis difference associated with the recently acquired 24.99% membership interest in Rockies Express at June 30, 2017 was allocated as follows: Basis Difference Amortization Period (in thousands) Long-term debt $ 19,291 2 - 25 years Property, plant and equipment (402,984 ) 35 years Total basis difference $ (383,693 ) TEP Acquisition of Tallgrass Terminals, LLC and Tallgrass NatGas Operator, LLC Effective January 1, 2017, TEP acquired 100% of the issued and outstanding membership interests in Terminals and 100% of the issued and outstanding membership interests in NatGas from TD for total cash consideration of $140 million . These acquisitions are considered transactions between entities under common control, and a change in reporting entity. Terminals owns several fully operational assets providing storage capacity and additional injection points for the Pony Express System, including the Sterling Terminal near Sterling, Colorado, the Buckingham Terminal in northeast Colorado, and a 20% interest in the Deeprock Development Terminal in Cushing, Oklahoma. Our 20% membership interest in Deeprock Development as of June 30, 2017 and December 31, 2016 is recorded under the equity method of accounting and reported as "Unconsolidated investments" on our condensed consolidated balance sheets. As discussed in Note 15 – Subsequent Events , Terminals acquired an additional 49% membership interest in Deeprock Development in July 2017. Terminals also owns acreage in Cushing, Oklahoma and Guernsey, Wyoming, which is under development to provide additional storage capacity, and other potential opportunities. NatGas is the operator of the Rockies Express Pipeline and receives a fee from Rockies Express as compensation for its services. Historical Financial Information The results of our acquisitions of Terminals and NatGas are included in the condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016 . The following table presents our previously reported December 31, 2016 condensed consolidated balance sheet, adjusted for the acquisitions of Terminals and NatGas: December 31, 2016 TEGP (As previously reported) Consolidate Terminals Consolidate NatGas TEGP (As currently reported) (in thousands) ASSETS Current Assets: Cash and cash equivalents $ 2,459 $ — $ — $ 2,459 Accounts receivable, net 59,469 38 29 59,536 Gas imbalances 1,597 — — 1,597 Inventories 12,805 288 — 13,093 Derivative assets 10,967 — — 10,967 Prepayments and other current assets 6,820 808 — 7,628 Total Current Assets 94,117 1,134 29 95,280 Property, plant and equipment, net 2,012,263 66,969 — 2,079,232 Goodwill 343,288 — — 343,288 Intangible asset, net 93,522 — — 93,522 Unconsolidated investments 461,915 13,710 — 475,625 Deferred tax asset 521,454 — — 521,454 Deferred financing costs, net 6,042 — — 6,042 Deferred charges and other assets 9,637 1,400 — 11,037 Total Assets $ 3,542,238 $ 83,213 $ 29 $ 3,625,480 LIABILITIES AND EQUITY Current Liabilities: Accounts payable $ 24,403 $ 46 $ — $ 24,449 Accounts payable to related parties 5,768 56 — 5,824 Gas imbalances 1,239 — — 1,239 Derivative liabilities 556 — — 556 Accrued taxes 16,328 668 — 16,996 Accrued liabilities 16,578 177 — 16,755 Deferred revenue 60,757 — — 60,757 Other current liabilities 6,446 — — 6,446 Total Current Liabilities 132,075 947 — 133,022 Long-term debt, net 1,555,981 — — 1,555,981 Other long-term liabilities and deferred credits 7,063 — — 7,063 Total Long-term Liabilities 1,563,044 — — 1,563,044 Equity: Net Equity 1,847,119 82,266 29 1,929,414 Total Equity 1,847,119 82,266 29 1,929,414 Total Liabilities and Equity $ 3,542,238 $ 83,213 $ 29 $ 3,625,480 The results of our acquisitions of Terminals and NatGas are included in the condensed consolidated statements of income for the three and six months ended June 30, 2017 and 2016 . The following tables present the previously reported condensed consolidated statements of income for the three and six months ended June 30, 2016 , adjusted for the acquisitions of Terminals and NatGas: Three Months Ended June 30, 2016 TEGP (As previously reported) Consolidate Terminals Consolidate NatGas Elimination (1) TEGP (As currently reported) (in thousands) Revenues: Crude oil transportation services $ 93,322 $ — $ — $ — $ 93,322 Natural gas transportation services 28,682 — — — 28,682 Sales of natural gas, NGLs, and crude oil 16,830 — — — 16,830 Processing and other revenues 8,097 2,957 1,992 (2,865 ) 10,181 Total Revenues 146,931 2,957 1,992 (2,865 ) 149,015 Operating Costs and Expenses: Cost of sales (exclusive of depreciation and amortization shown below) 15,958 — — — 15,958 Cost of transportation services (exclusive of depreciation and amortization shown below) 14,240 200 — (2,865 ) 11,575 Operations and maintenance 13,864 406 — — 14,270 Depreciation and amortization 21,576 314 — — 21,890 General and administrative 14,458 413 — — 14,871 Taxes, other than income taxes 5,639 144 — — 5,783 Contract termination — 8,061 (2) — — 8,061 Loss on disposal of assets 1,849 — — — 1,849 Total Operating Costs and Expenses 87,584 9,538 — (2,865 ) 94,257 Operating Income (Loss) 59,347 (6,581 ) 1,992 — 54,758 Other Income (Expense): Interest expense, net (10,441 ) — — — (10,441 ) Unrealized gain on derivative instrument 18,953 — — — 18,953 Equity in earnings of unconsolidated investments 23,321 701 — — 24,022 Other income, net 221 — — — 221 Total Other Income 32,054 701 — — 32,755 Net income (loss) before tax 91,401 (5,880 ) 1,992 — 87,513 Deferred income tax expense (6,792 ) — — — (6,792 ) Net income (loss) 84,609 (5,880 ) 1,992 — 80,721 Net income attributable to noncontrolling interests (81,161 ) — — — (81,161 ) Net income (loss) attributable to TEGP $ 3,448 $ (5,880 ) $ 1,992 $ — $ (440 ) Six Months Ended June 30, 2016 TEGP (As previously reported) Consolidate Terminals Consolidate NatGas Elimination (1) TEGP (As currently reported) (in thousands) Revenues: Crude oil transportation services $ 187,894 $ — $ — $ — $ 187,894 Natural gas transportation services 57,962 — — — 57,962 Sales of natural gas, NGLs, and crude oil 30,756 — — — 30,756 Processing and other revenues 15,724 5,866 3,673 (5,692 ) 19,571 Total Revenues 292,336 5,866 3,673 (5,692 ) 296,183 Operating Costs and Expenses: Cost of sales (exclusive of depreciation and amortization shown below) 29,526 — — — 29,526 Cost of transportation services (exclusive of depreciation and amortization shown below) 30,396 400 — (5,692 ) 25,104 Operations and maintenance 26,341 887 — — 27,228 Depreciation and amortization 43,268 629 — — 43,897 General and administrative 27,995 887 — — 28,882 Taxes, other than income taxes 13,145 288 — — 13,433 Contract termination — 8,061 (2) — — 8,061 Loss on disposal of assets 1,849 — — — 1,849 Total Operating Costs and Expenses 172,520 11,152 — (5,692 ) 177,980 Operating Income (Loss) 119,816 (5,286 ) 3,673 — 118,203 Other Income (Expense): Interest expense, net (19,118 ) — — — (19,118 ) Unrealized gain on derivative instrument 10,007 — — — 10,007 Equity in earnings of unconsolidated investments 23,321 1,410 — — 24,731 Other income, net 787 — — — 787 Total Other Income 14,997 1,410 — — 16,407 Net income (loss) before tax 134,813 (3,876 ) 3,673 — 134,610 Deferred income tax expense (9,583 ) — — — (9,583 ) Net income (loss) 125,230 (3,876 ) 3,673 — 125,027 Net income attributable to noncontrolling interests (114,193 ) — — — (114,193 ) Net income (loss) attributable to TEGP $ 11,037 $ (3,876 ) $ 3,673 $ — $ 10,834 (1) Represents the elimination of revenue and cost of transportation services associated with the lease of the Sterling Terminal facilities by Pony Express. (2) Represents a one-time charge related to the termination of an operating agreement at the Sterling Terminal.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	As a result of our relationship with TD and its affiliates, we have entered into a number of related party transactions. The following disclosure includes those related party transactions which are not otherwise disclosed in these notes to our condensed consolidated financial statements. We have no employees. In connection with the closing of the TEP initial public offering on May 17, 2013, TEP and its general partner entered into an Omnibus Agreement with TD and certain of its affiliates, including Tallgrass Operations, LLC (the "TEP Omnibus Agreement"). The TEP Omnibus Agreement provides that, among other things, TEP will reimburse TD and its affiliates for all expenses they incur and payments they make on TEP's behalf, including the costs of employee and director compensation and benefits as well as the cost of the provision of certain centralized corporate functions performed by TD, including legal, accounting, cash management, insurance administration and claims processing, risk management, health, safety and environmental, information technology and human resources in each case to the extent reasonably allocable to TEP. In addition, in connection with the closing of our initial public offering on May 12, 2015 (the "TEGP IPO"), TEGP entered into an Omnibus Agreement (the "TEGP Omnibus Agreement") with TEGP Management, LLC, Tallgrass Equity and Tallgrass Energy Holdings, LLC (which is the general partner of TD). Pursuant to the TEGP Omnibus Agreement, Tallgrass Equity pays a reimbursement to TD for costs associated with TEGP being a public company beginning in the second quarter of 2015, which was $500,000 for the second quarter of 2017 . This amount will be periodically reviewed and adjusted as necessary to continue to reflect reasonable allocation of costs to TEGP. Totals of transactions with affiliated companies, excluding transactions disclosed elsewhere in these notes, are as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Cost of transportation services (1) $ 4,907 $ 4,829 $ 9,414 $ 9,258 Charges to TEGP: (2) Property, plant and equipment, net $ 510 $ 649 $ 803 $ 1,567 Operations and maintenance $ 7,430 $ 6,373 $ 13,707 $ 12,557 General and administrative $ 11,095 $ 10,206 $ 20,668 $ 19,643 (1) Reflects rent expense for the crude oil storage at the Deeprock Terminal. (2) Charges to TEGP, inclusive of Tallgrass Equity and TEP, include directly charged wages and salaries, other compensation and benefits, and shared services. Details of balances with affiliates included in "Accounts receivable, net" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows: June 30, 2017 December 31, 2016 (in thousands) Receivable from related parties: Rockies Express Pipeline LLC $ 1,029 $ 590 Total receivable from related parties $ 1,029 $ 590 Accounts payable to related parties: Tallgrass Operations, LLC $ 5,778 $ 5,811 Deeprock Development, LLC — 13 Total accounts payable to related parties $ 5,778 $ 5,824 Gas imbalances with affiliated shippers are as follows: June 30, 2017 December 31, 2016 (in thousands) Affiliate gas imbalance receivables $ — $ 177 Affiliate gas imbalance payables $ 205 $ —

Inventory

Inventory	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventory	The components of inventory at June 30, 2017 and December 31, 2016 consisted of the following: June 30, 2017 December 31, 2016 (in thousands) Crude oil $ 2,909 $ 5,462 Materials and supplies 6,366 6,383 Natural gas liquids 413 265 Gas in underground storage 1,553 983 Total inventory $ 11,241 $ 13,093

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	A summary of net property, plant and equipment by classification is as follows: June 30, 2017 December 31, 2016 (in thousands) Crude oil pipelines $ 1,218,337 $ 1,202,125 Natural gas pipelines 572,749 572,150 Gathering, processing and treating assets (1) 401,186 256,901 General and other 253,508 223,310 Construction work in progress 22,513 20,606 Accumulated depreciation and amortization (235,539 ) (195,860 ) Total property, plant and equipment, net $ 2,232,754 $ 2,079,232 (1) Includes approximately $138.2 million of assets associated with the Douglas Gathering System acquired in June 2017.

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates (Notes)	6 Months Ended
	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures Disclosure	Rockies Express Our investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. During the six months ended June 30, 2017 , we recognized equity in earnings associated with our 49.99% membership interest in Rockies Express of $62.1 million , inclusive of the amortization of the negative basis difference, and received distributions from and made contributions to Rockies Express of $89.4 million and $17.8 million , respectively. As discussed in Note 4 – Acquisitions , we acquired an additional 24.99% membership interest in Rockies Express from TD on March 31, 2017. Summarized financial information for Rockies Express is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Revenue $ 207,149 $ 175,350 $ 408,487 $ 391,902 Operating income $ 112,703 $ 85,352 $ 220,072 $ 201,411 Net income to Members $ 70,945 $ 112,728 $ 137,195 $ 192,663

Risk Management

Risk Management	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Risk Management	We occasionally enter into derivative contracts with third parties for the purpose of hedging exposures that accompany our normal business activities. Our normal business activities directly and indirectly expose us to risks associated with changes in the market price of crude oil and natural gas, among other commodities. For example, the risks associated with changes in the market price of crude oil and natural gas include, among others (i) pre-existing or anticipated physical crude oil and natural gas sales, (ii) natural gas purchases and (iii) natural gas system use and storage. We have elected not to apply hedge accounting and changes in the fair value of all derivative contracts are recorded in earnings in the period in which the change occurs. Fair Value of Derivative Contracts The following table summarizes the fair values of our derivative contracts included in the condensed consolidated balance sheets: Balance Sheet June 30, 2017 December 31, 2016 (in thousands) Crude oil derivative contracts (1) Current assets $ 207 $ — Natural gas derivative contracts (2) Current assets $ 13 $ 291 Call option derivative (3) Current assets $ — $ 10,676 Crude oil derivative contracts (1) Current liabilities $ — $ 440 Natural gas derivative contracts (2) Current liabilities $ — $ 116 (1) The fair value shown for crude oil derivative contracts represents the sale of 30,000 barrels and 125,000 barrels of crude oil as of June 30, 2017 and December 31, 2016 , respectively, which will settle throughout 2017. (2) As of June 30, 2017 , the fair value shown for natural gas derivative contracts was comprised of derivative volumes for long natural gas fixed-price swaps totaling 0.2 Bcf. As of December 31, 2016 , the fair value shown for natural gas derivative contracts was comprised of derivative volumes for short and long natural gas fixed-price swaps totaling 0.3 Bcf and 0.4 Bcf, respectively. (3) As discussed below, in conjunction with TEP's acquisition of an additional 31.3% membership interest in Pony Express effective January 1, 2016, TD granted TEP an 18 month call option covering the 6,518,000 common units issued to TD. As of February 1, 2017, no common units remained subject to the call option. Effect of Derivative Contracts in the Statements of Income The following table summarizes the impact of derivative contracts not designated as hedging contracts for the three and six months ended June 30, 2017 and 2016 : Contract Type Location of gain (loss) recognized Amount of gain (loss) recognized in income on derivatives Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Crude oil derivative contracts Sales of natural gas, NGLs, and crude oil $ 227 $ 148 $ 890 $ 148 Natural gas derivative contracts Sales of natural gas, NGLs, and crude oil $ (67 ) $ (307 ) $ 106 $ (351 ) Call option derivative Unrealized gain on derivative instrument $ — $ 18,953 $ 1,885 $ 10,007 Call Option Derivative As part of TEP's acquisition of an additional 31.3% membership interest in Pony Express effective January 1, 2016, TD granted TEP an 18 month call option at an exercise price of $42.50 per TEP common unit covering the 6,518,000 TEP common units issued to TD as a portion of the consideration. In July 2016 and October 2016, TEP partially exercised the call option covering 3,563,146 and 1,251,760 common units, respectively, for cash payments of $151.4 million and $53.2 million , respectively. On February 1, 2017 , TEP exercised the remainder of the call option covering an additional 1,703,094 common units for a cash payment of $72.4 million . These common units were deemed canceled upon the exercise of the call option and as of the applicable exercise date were no longer issued and outstanding. Credit Risk We have counterparty credit risk as a result of our use of derivative contracts. Counterparties to our crude oil and natural gas derivatives consist of major financial institutions. This concentration of counterparties may impact our overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions. The counterparty to our call option derivative was TD. Our over-the-counter swaps are entered into with counterparties outside central trading organizations such as futures, options or stock exchanges. These contracts are with financial institutions with investment grade credit ratings. While we enter into derivative transactions principally with investment grade counterparties and actively monitor their credit ratings, it is nevertheless possible that from time to time losses will result from counterparty credit risk in the future. The maximum potential exposure to credit losses on our crude oil and natural gas derivative contracts at June 30, 2017 was: Asset Position (in thousands) Gross $ 220 Netting agreement impact — Cash collateral held — Net exposure $ 220 As of June 30, 2017 and December 31, 2016 , we did not have any outstanding letters of credit or cash in margin accounts in support of our hedging of commodity price risks associated with our commodity derivative contracts nor did we have any margin deposits with counterparties associated with our commodity derivative contracts. Fair Value Derivative assets and liabilities are measured and reported at fair value. Derivative contracts can be exchange-traded or over-the-counter ("OTC"). OTC commodity derivatives are valued using models utilizing a variety of inputs including contractual terms and commodity and interest rate curves. The selection of a particular model and particular inputs to value an OTC derivative contract depends upon the contractual terms of the instrument as well as the availability of pricing information in the market. We use similar models to value similar instruments. For OTC derivative contracts that trade in liquid markets, such as generic forwards and swaps, model inputs can generally be verified and model selection does not involve significant management judgment. Such contracts are typically classified within Level 2 of the fair value hierarchy. The call option granted by TD was valued using a Black-Scholes option pricing model. Key inputs to the valuation model include the term of the option, risk free rate, the exercise price and current market price, expected volatility and expected distribution yield of the underlying units. The call option valuation was classified within Level 2 of the fair value hierarchy as the value was based on significant observable inputs. The following table summarizes the fair value measurements of our derivative contracts as of June 30, 2017 and December 31, 2016 based on the fair value hierarchy: Asset Fair Value Measurements Using Total Quoted prices in Significant Significant (in thousands) As of June 30, 2017: Crude oil derivative contracts $ 207 $ — $ 207 $ — Natural gas derivative contracts $ 13 $ — $ 13 $ — As of December 31, 2016: Call option derivative $ 10,676 $ — $ 10,676 $ — Natural gas derivative contracts $ 291 $ — $ 291 $ — Liability Fair Value Measurements Using Total Quoted prices in Significant Significant (in thousands) As of December 31, 2016: Crude oil derivative contracts $ 440 $ — $ 440 $ — Natural gas derivative contracts $ 116 $ — $ 116 $ —

Long-term Debt

Long-term Debt	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Long-term Debt	Long-term debt consisted of the following at June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 (in thousands) Tallgrass Equity revolving credit facility $ 147,000 $ 148,000 TEP revolving credit facility 1,348,000 1,015,000 TEP 5.50% senior notes due September 15, 2024 750,000 400,000 Less: Deferred financing costs, net (1) (10,432 ) (7,019 ) Total long-term debt, net $ 2,234,568 $ 1,555,981 (1) Deferred financing costs, net as presented above relate solely to the 2024 Notes. Deferred financing costs associated with our revolving credit facilities are presented in noncurrent assets on our condensed consolidated balance sheets. TEP Senior Unsecured Notes On September 1, 2016, TEP and Tallgrass Energy Finance Corp. (the "Co-Issuer" and together with TEP, the "Issuers"), the Guarantors named therein and U.S. Bank, National Association, as trustee, entered into an Indenture dated September 1, 2016 (the "Indenture"), pursuant to which the Issuers issued $400 million in aggregate principal amount of 5.50% senior notes due 2024 (the "2024 Notes"). On May 16, 2017, the Issuers issued an additional $350 million in aggregate principal amount of the 2024 Notes which are also governed by the Indenture. The notes issued on September 1, 2016 and May 16, 2017 are treated as a single class of debt securities and have identical terms, other than the issue date, offering price and first interest payment date. The Indenture contains covenants that, among other things, limit TEP's ability and the ability of its restricted subsidiaries to: (i) incur, assume or guarantee additional indebtedness or issue preferred units; (ii) create liens to secure indebtedness; (iii) pay distributions on equity interests, repurchase equity securities or redeem subordinated securities; (iv) make investments; (v) restrict distributions, loans or other asset transfers from TEP's restricted subsidiaries; (vi) consolidate with or merge with or into, or sell substantially all of TEP's properties to, another person; (vii) sell or otherwise dispose of assets, including equity interests in subsidiaries; and (viii) enter into transactions with affiliates. As of June 30, 2017 , TEP is in compliance with the covenants required under the 2024 Notes. Tallgrass Equity Revolving Credit Facility The following table sets forth the available borrowing capacity under the Tallgrass Equity revolving credit facility as of June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 (in thousands) Total capacity under Tallgrass Equity revolving credit facility $ 150,000 $ 150,000 Less: Outstanding borrowings under the Tallgrass Equity revolving credit facility (147,000 ) (148,000 ) Available capacity under the Tallgrass Equity revolving credit facility $ 3,000 $ 2,000 In connection with the TEGP IPO, Tallgrass Equity entered into a $150 million senior secured revolving credit facility with Barclays Bank PLC, as administrative agent, and a syndicate of lenders, which will mature on May 12, 2020. Among various other covenants and restrictive provisions, Tallgrass Equity is required to maintain a total leverage ratio of not more than 3.00 to 1.00. As of June 30, 2017 , Tallgrass Equity is in compliance with the covenants required under the revolving credit facility. The unused portion of the revolving credit facility is subject to a commitment fee of 0.50% . As of June 30, 2017 , the weighted average interest rate on outstanding borrowings under the Tallgrass Equity revolving credit facility was 3.73% . During the six months ended June 30, 2017 , Tallgrass Equity's weighted average effective interest rate, including the interest on outstanding borrowings, commitment fees, and amortization of deferred financing costs, was 3.74% . TEP Revolving Credit Facility On June 2, 2017, TEP entered into a $1.75 billion Second Amended and Restated Credit Agreement with Wells Fargo Bank, National Association, as administrative agent and collateral agent, and a syndicate of lenders (the "Amended Credit Agreement"). The Amended Credit Agreement amends and restates TEP's existing revolving credit facility. The Amended Credit Agreement, among other things, extends the maturity date of TEP's existing revolving credit facility from May 13, 2018 to June 2, 2022, and provides for an uncommitted accordion in an amount up to an additional $250 million , subject to the satisfaction of certain other conditions. In addition, the revolving credit facility includes a $60 million sublimit for swing line loans and a $75 million sublimit for letters of credit. The following table sets forth the available borrowing capacity under the TEP revolving credit facility as of June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 (in thousands) Total capacity under the TEP revolving credit facility $ 1,750,000 $ 1,750,000 Less: Outstanding borrowings under the TEP revolving credit facility (1,348,000 ) (1,015,000 ) Less: Letters of credit issued under the TEP revolving credit facility (60 ) — Available capacity under the TEP revolving credit facility $ 401,940 $ 735,000 TEP's revolving credit facility contains various covenants and restrictive provisions that, among other things, limit or restrict TEP's ability (as well as the ability of its restricted subsidiaries) to incur or guarantee additional debt, incur certain liens on assets, dispose of assets, make certain distributions, including distributions from available cash, if a default or event of default under the credit agreement then exists or would result, therefrom, change the nature of its business, engage in certain mergers or make certain investments and acquisitions, enter into non-arms-length transactions with affiliates and designate certain subsidiaries as "Unrestricted Subsidiaries." In addition, TEP is required to maintain a consolidated leverage ratio of not more than 5.00 to 1.00 (which will be increased to 5.50 to 1.00 for certain measurement periods following the consummation of certain acquisitions), a consolidated senior secured leverage ratio of not more than 3.75 to 1.00 and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of June 30, 2017 , TEP is in compliance with the covenants required under its revolving credit facility. The unused portion of TEP's revolving credit facility is subject to a commitment fee, which ranges from 0.250% to 0.500% , based on TEP's total leverage ratio. As of June 30, 2017 , the weighted average interest rate on outstanding borrowings under the TEP revolving credit facility was 2.92% . During the six months ended June 30, 2017 , the weighted average effective interest rate under the TEP revolving credit facility, including the interest on outstanding borrowings under TEP's revolving credit facility, commitment fees, and amortization of deferred financing costs, was 3.17% . Fair Value The following table sets forth the carrying amount and fair value of our long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016 , but for which fair value is disclosed: Fair Value Quoted prices Significant Significant Total Carrying (in thousands) As of June 30, 2017: Revolving credit facilities $ — $ 1,495,000 $ — $ 1,495,000 $ 1,495,000 2024 Notes $ — $ 763,695 $ — $ 763,695 $ 739,568 As of December 31, 2016: Revolving credit facilities $ — $ 1,163,000 $ — $ 1,163,000 $ 1,163,000 2024 Notes $ — $ 398,000 $ — $ 398,000 $ 392,981 The long-term debt borrowed under the revolving credit facilities is carried at amortized cost. As of June 30, 2017 and December 31, 2016 , the fair value of borrowings under the revolving credit facilities approximates the carrying amount of the borrowings using a discounted cash flow analysis. The 2024 Notes are carried at amortized cost, net of deferred financing costs. The estimated fair value of the 2024 Notes is based upon quoted market prices adjusted for illiquid markets. We are not aware of any factors that would significantly affect the estimated fair value subsequent to June 30, 2017 .

Partnership Equity and Distribu

Partnership Equity and Distributions	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Partnership Equity and Distributions	TEGP Partnership Agreement and Distributions to Holders of Class A Shares The following table details the distributions for the periods indicated: Three Months Ended Date Paid Distributions to Class A Shareholders Distributions per Class A Share (in thousands) June 30, 2017 August 14, 2017 (1) $ 19,891 $ 0.3425 March 31, 2017 May 15, 2017 16,697 0.2875 December 31, 2016 February 14, 2017 16,116 0.2775 September 30, 2016 November 14, 2016 12,528 0.2625 June 30, 2016 August 12, 2016 11,693 0.2450 March 31, 2016 May 13, 2016 10,022 0.2100 (1) The distribution announced on July 5, 2017 for the second quarter of 2017 will be paid on August 14, 2017 to Class A shareholders of record at the close of business on July 28, 2017 . Subsidiary Distributions TEP Distributions . The following table shows the distributions for the periods indicated: Distributions Limited Partner General Partner Distributions Three Months Ended Date Paid Incentive Distribution Rights General Partner Units Total (in thousands, except per unit amounts) June 30, 2017 August 14, 2017 (1) $ 67,671 $ 36,342 $ 1,186 $ 105,199 $ 0.9250 March 31, 2017 May 15, 2017 60,486 29,840 1,040 91,366 0.8350 December 31, 2016 February 14, 2017 58,793 28,358 1,008 88,159 0.8150 September 30, 2016 November 14, 2016 57,332 26,987 976 85,295 0.7950 June 30, 2016 August 12, 2016 54,442 24,262 911 79,615 0.7550 March 31, 2016 May 13, 2016 48,238 19,816 830 68,884 0.7050 (1) The distribution announced on July 5, 2017 for the second quarter of 2017 will be paid on August 14, 2017 to unitholders of record at the close of business on July 28, 2017 . Repurchase of TEP Common Units Owned by TD Following an offer received from TD with respect to TEP common units owned by TD not subject to the call option, TEP repurchased 736,262 TEP common units from TD at an aggregate price of approximately $35.3 million , or $47.99 per common unit, on February 1, 2017 , which was approved by the conflicts committee of the board of directors of TEP's general partner. These common units were deemed canceled upon TEP's purchase and as of such transaction date were no longer issued and outstanding. TEP Equity Distribution Agreements As of June 30, 2017 , TEP had active equity distribution agreements pursuant to which it may sell from time to time through a group of managers, as its sales agents, TEP common units representing limited partner interests having an aggregate offering price of up to $100.2 million and $657.5 million . Net cash proceeds from any sale of the TEP common units may be used for general partnership purposes, which includes, among other things, TEP's exercise of the call option with respect to the 6,518,000 common units issued to TD in connection with TEP's acquisition of an additional 31.3% of Pony Express in January 2016, repayment or refinancing of debt, funding for acquisitions, capital expenditures and additions to working capital. During the six months ended June 30, 2017 , TEP issued and sold 2,341,061 common units with a weighted average sales price of $48.82 per unit under its equity distribution agreements for net cash proceeds of approximately $112.8 million (net of approximately $1.5 million in commissions and professional service expenses). TEP used the net cash proceeds for general partnership purposes as described above. Noncontrolling Interests As of June 30, 2017 , noncontrolling interests in our subsidiaries consisted of a 63.06% interest in Tallgrass Equity held by the Exchange Right Holders, as defined in Note 12 – Net Income per Class A Share , the 72.61% limited partner interest in TEP held by TD and the public TEP unitholders and the 2.0% membership interest in Pony Express held by TD. During the six months ended June 30, 2017 , we recognized contributions from and distributions to noncontrolling interests of $0.9 million and $145.1 million , respectively. Contributions from noncontrolling interests consisted primarily of contributions from TD to Pony Express. Distributions to noncontrolling interests consisted of distributions to TEP unitholders of $86.3 million , Tallgrass Equity distributions to the Exchange Right Holders of $56.0 million , and distributions to Pony Express and Water Solutions noncontrolling interests of $2.8 million . During the six months ended June 30, 2016 , we received contributions from and made distributions to noncontrolling interests of $7.3 million and $109.6 million , respectively. Contributions from noncontrolling interests primarily consisted of contributions from TD to Pony Express. Distributions to noncontrolling interests consisted of distributions to TEP unitholders of $64.3 million , Tallgrass Equity distributions to Exchange Right Holders of $41.9 million and distributions to Pony Express noncontrolling interests in the aggregate of $3.3 million . Other Contributions and Distributions During the six months ended June 30, 2017 , TEP received contributions from TD of $2.3 million , primarily to indemnify TEP for costs associated with Trailblazer's Pipeline Integrity Management Program, as discussed in Note 14 – Legal and Environmental Matters .

Net Income per Class A Share Ne

Net Income per Class A Share Net Income per Class A Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income per Class A Share	Basic net income per Class A share is determined by dividing net income attributable to TEGP by the weighted average number of outstanding Class A shares during the period. Class B shares do not share in the earnings of the Partnership. Accordingly, basic and diluted net income per Class B share has not been presented. Diluted net income per Class A share is determined by dividing net income attributable to TEGP by the weighted average number of outstanding diluted Class A shares during the period. For purposes of calculating diluted net income per Class A share, we considered the impact of possible future exercises of the Exchange Right by the Exchange Right Holders on both net income attributable to TEGP and the diluted weighted average number of Class A shares outstanding. The Exchange Right Holders refers to the group of persons who collectively own all of TEGP's outstanding Class B shares and an equivalent number of Tallgrass Equity units. The Exchange Right Holders are entitled to exercise the right to exchange their Tallgrass Equity units (together with an equivalent number of TEGP Class B shares) for TEGP Class A shares at an exchange ratio of one TEGP Class A share for each Tallgrass Equity unit exchanged, which we refer to as the Exchange Right. The Exchange Right Holders primarily consist of Kelso & Company and its affiliated investment funds, The Energy & Minerals Group and its affiliated investment funds, and Tallgrass KC, LLC, which is an entity owned by certain members of TEGP's and TEP's management. Pursuant to the TEGP partnership agreement and the Tallgrass Equity limited liability company agreement, our capital structure and the capital structure of Tallgrass Equity will generally replicate one another in order to maintain the one-for-one exchange ratio between the Tallgrass Equity units and Class B shares, on the one hand, and our Class A shares, on the other hand. As a result, the exchange of any Class B shares for Class A shares does not have a dilutive effect on basic net income per Class A share. However, for the six months ended June 30, 2017 and 2016 , the potential issuance of TEGP Equity Participation Shares would have had a dilutive effect on basic net income per Class A share. All net income or loss from Terminals and NatGas prior to TEP's acquisition on January 1, 2017 is allocated to predecessor operations in the condensed consolidated statements of income. Historical earnings of transferred businesses for periods prior to the date of those common control transactions are solely those of the general partner, and therefore we have appropriately excluded any allocation to the TEP limited partner units when determining net income available to TEP common unitholders. Accordingly, no net income or loss from Terminals and NatGas is allocated to our Class A shareholders. We present the financial results of any transferred business prior to the transaction date in the line item "Predecessor operations interest in net loss" in the condensed consolidated statements of income. The following table illustrates the calculation of net income per Class A share for the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands, except per share data) Basic Net Income per Class A Share Net income attributable to TEGP, excluding predecessor operations interest $ 8,753 $ 3,448 $ 20,782 $ 11,037 Basic weighted average Class A Shares outstanding 58,075 47,725 58,075 47,725 Basic net income per Class A share $ 0.15 $ 0.07 $ 0.36 $ 0.23 Diluted Net Income per Class A Share Net income attributable to TEGP, excluding predecessor operations interest $ 8,753 $ 3,448 $ 20,782 $ 11,037 Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares 38 1 64 — Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares $ 8,791 $ 3,449 $ 20,846 $ 11,037 Basic weighted average Class A Shares outstanding 58,075 47,725 58,075 47,725 Equity Participation Shares equivalent shares 117 9 112 — Diluted weighted average Class A Shares outstanding 58,192 47,734 58,187 47,725 Diluted net income per Class A Share $ 0.15 $ 0.07 $ 0.36 $ 0.23

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2017
Regulatory Matters [Abstract]
Regulatory Matters	There are no regulatory proceedings challenging the rates of Pony Express, Rockies Express, Tallgrass Interstate Gas Transmission, LLC ("TIGT") or Trailblazer Pipeline Company LLC ("Trailblazer"). We have made certain regulatory filings with the FERC, including the following: Pony Express On May 22, 2017 and May 31, 2017, Pony Express made tariff filings with the FERC in Docket Nos. IS17-263-000, IS17-464-00, and IS17-465-000 to increase the contract and non-contract rates by an amount reflecting the most recent FERC annual index adjustment of approximately 0.2% , which became effective July 1, 2017. Rockies Express Rockies Express Zone 3 Capacity Enhancement Project – FERC Docket No. CP15-137-000 On March 31, 2015 in Docket No. CP15-137-000, Rockies Express filed with the FERC an application for authorization to construct and operate (1) three new mainline compressor stations located in Pickaway and Fayette Counties, Ohio and Decatur County, Indiana; (2) additional compressors at an existing compressor station in Muskingum County, Ohio; and (3) certain ancillary facilities. The facilities increased the Rockies Express Zone 3 east-to-west mainline capacity by 0.8 Bcf/d. Pursuant to the FERC's obligations under the National Environmental Policy Act, FERC staff issued an Environmental Assessment for the project on August 31, 2015. On February 25, 2016, the FERC issued a Certificate of Public Convenience and Necessity authorizing Rockies Express to proceed with the project. On March 14, 2016, Rockies Express commenced construction of the project facilities. The project was placed in-service for the 0.8 Bcf/d on January 6, 2017. 2016 Annual and Interim FERC Fuel Tracking Filings - FERC Docket Nos. RP16-702 and RP17-240 On March 1, 2016, Rockies Express made its annual fuel tracker filing with a proposed effective date of April 1, 2016 in Docket No. RP16-702. The FERC issued an order accepting the filing on March 25, 2016. On December 1, 2016, Rockies Express made an interim fuel tracker filing with a proposed effective date of January 1, 2017 in Docket No. RP17-240. The FERC issued an order accepting the filing on December 29, 2016. Electric Power Charge Clarification - FERC Docket No. RP17-285 On December 21, 2016, in Docket No. RP17-285, Rockies Express proposed certain revisions to the General Terms and Conditions of its tariff to clarify that the electric power costs associated with the operation of gas coolers installed in association with the Zone 3 Capacity Enhancement Project, at both electric and gas powered stations, will be included in the Power Cost Tracker. Several shippers submitted comments on the proposal. The FERC issued an order on January 19, 2017 accepting the proposed revisions permitting the recovery of electric power costs from the operation of both gas and electric powered compressor stations, subject to certain clarifications. 2017 Annual FERC Fuel Tracking Filing - FERC Docket No. RP17-401-000 On February 13, 2017, in Docket No. RP17-401-000, Rockies Express made its annual fuel and power cost tracker filing with a proposed effective date of April 1, 2017. The FERC issued an order accepting the filing, including certain requested waivers, on March 21, 2017. TIGT General Rate Case Filing - FERC Docket No. RP16-137-000, et seq. On October 30, 2015, TIGT filed a general rate case with the FERC pursuant to Section 4 of the National Gas Act ("NGA"). The rate case proposed, among other things, a general system-wide increase in the maximum tariff rates for all firm and interruptible services offered by TIGT, certain changes to the transportation rate design of its system, a fixed fuel and lost and unaccounted for ("FL&U") and power cost tracker, and certain pro forma tariff records reflecting revisions to TIGT's Tariff. On June 8, 2016, TIGT filed an Offer of Settlement (the "TIGT Rate Case Settlement") with the FERC, which resolved all issues the FERC had set for hearing. Following certification by the Administrative Law Judge and approval by the FERC, TIGT filed revised tariff records to implement the TIGT Rate Case Settlement, which the FERC subsequently approved on December 23, 2016. Per the terms of the TIGT Rate Case Settlement, TIGT is required to file a new general rate case on May 1, 2019 (provided that such rate case is not pre-empted by a pre-filing settlement). On February 3, 2017, the FERC accepted TIGT’s pro forma tariff records, subject to conditions, and directed TIGT to file the actual tariff records within 30 days. TIGT subsequently submitted a compliance filing to implement the actual tariff records and restate its tariff to be effective April 1, 2017 and also filed to cancel its existing tariff (which was ultimately superseded by the new tariff). On March 16, 2017, the FERC accepted both filings. 2017 Annual Fuel Tracker Filing - FERC Docket No. RP17-428-000 On February 27, 2017, TIGT made its annual fuel tracker filing with a proposed effective date of April 1, 2017 in Docket No. RP17-428-000. The filing incorporated the FL&U tracker and power cost tracker mechanisms agreed to in the TIGT Rate Case Settlement. The FERC accepted the filing on March 21, 2017. Trailblazer 2017 Annual Fuel Tracker Filing - FERC Docket No. RP17-549-000 On March 22, 2017, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2017 in Docket No. RP17-549. The FERC accepted the filing on April 19, 2017.

Legal and Environmental Matters

Legal and Environmental Matters	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Legal and Environmental Matters	Legal In addition to the matters discussed below, we are a defendant in various lawsuits arising from the day-to-day operations of our business. Although no assurance can be given, we believe, based on our experiences to date, that the ultimate resolution of such routine items will not have a material adverse impact on our business, financial position, results of operations, or cash flows. We have evaluated claims in accordance with the accounting guidance for contingencies that we deem both probable and reasonably estimable and, accordingly, have recorded no reserve for legal claims as of June 30, 2017 or December 31, 2016 . Rockies Express Ultra Resources In early 2016, Ultra Resources, Inc. ("Ultra") defaulted on its firm transportation service agreement for approximately 0.2 Bcf/d through November 11, 2019. In late March 2016, Rockies Express terminated Ultra's service agreement. On April 14, 2016, Rockies Express filed a lawsuit against Ultra for breach of contract and damages in Harris County, Texas, seeking approximately $303 million in damages and other relief. On April 29, 2016, Ultra and certain of its debtor affiliates filed for protection under Chapter 11 of the United States Bankruptcy Code in United States Bankruptcy Court for the Southern District of Texas, which operated as a stay of the Harris County state court proceeding. On January 12, 2017, Rockies Express and Ultra entered into an agreement to settle Rockies Express' approximately $303 million claim against Ultra. In accordance with the settlement agreement, Ultra made a cash payment to Rockies Express of $150 million on July 12, 2017, and entered into a new, seven-year firm transportation agreement with Rockies Express commencing December 1, 2019, for west-to-east service of 0.2 Bcf/d at a rate of approximately $0.37 per dth/d, or approximately $26.8 million annually. TEP received its proportionate distribution from the settlement in July 2017. Michels Corporation On June 17, 2014, Michels Corporation ("Michels") filed a complaint and request for relief against Rockies Express in the Court of Common Pleas, Monroe County, Ohio, as a result of work performed by Michels to construct the Seneca Lateral Pipeline in Ohio. Michels sought unspecified damages from Rockies Express and asserted claims of breach of contract, negligent misrepresentation, unjust enrichment and quantum meruit. Michels also filed notices of Mechanic's Liens in Monroe and Noble Counties, asserting $24.2 million as the amount due. On February 2, 2017, Rockies Express and Michels agreed to resolve Michels' claims for a $10 million cash payment by Rockies Express. The cash payment was inclusive of approximately $5.9 million that Rockies Express had been withholding from Michels. Subsequently, Rockies Express and Michels entered into a definitive agreement with respect to the settlement and Rockies Express made the $10 million cash payment to Michels on February 16, 2017. Environmental, Health and Safety We are subject to a variety of federal, state and local laws that regulate permitted activities relating to air and water quality, waste disposal, and other environmental matters. We believe that compliance with these laws will not have a material adverse impact on our business, cash flows, financial position or results of operations. However, there can be no assurances that future events, such as changes in existing laws, the promulgation of new laws, or the development of new facts or conditions will not cause us to incur significant costs. We had environmental reserves of $7.2 million and $4.0 million at June 30, 2017 and December 31, 2016 , respectively. TMID Casper Plant, EPA Notice of Violation In August 2011, the EPA and the Wyoming Department of Environmental Quality ("WDEQ") conducted an inspection of the Leak Detection and Repair ("LDAR") Program at the Casper Gas Plant in Wyoming. In September 2011, Tallgrass Midstream, LLC ("TMID") received a letter from the EPA alleging violations of the Standards of Performance of Equipment Leaks for Onshore Natural Gas Processing Plant requirements under the Clean Air Act. TMID received a letter from the EPA concerning settlement of this matter in April 2013 and received additional settlement communications from the EPA and Department of Justice beginning in July 2014. Settlement negotiations are continuing, including the expected inclusion of TIGT as a party to any possible settlement as a result of TIGT owning a compressor that is located adjacent to the Casper Gas Plant site. Casper Mystery Bridge Superfund Site The Casper Gas Plant is part of the Mystery Bridge Road/U.S. Highway 20 Superfund Site also known as Casper Mystery Bridge Superfund Site. Remediation work at the Casper Gas Plant has been completed and we have requested that the portion of the site attributable to us be delisted from the National Priorities List. Casper Gas Plant On November 25, 2014, WDEQ issued a Notice of Violation for violations of Part 60 Subpart OOOO related to the Depropanizer project (wv-14388, issued 7/9/13) in Docket No. 5506-14. TMID had discussed the issues in a meeting with WDEQ in Cheyenne on November 17, 2014, and submitted a disclosure on November 20, 2014 detailing the regulatory issues and potential violations. The project triggered a modification of Subpart OOOO for the entire plant. The project equipment as well as plant equipment subjected to Subpart OOOO was not monitored timely, and initial notification was not made timely. Settlement negotiations with WDEQ are currently ongoing. Trailblazer Pipeline Integrity Management Program Trailblazer is currently operating at less than its current maximum allowable operating pressure ("MAOP"), public notice of which was first provided in June 2014. As a result of smart tool surveys in 2014, Trailblazer identified approximately 25 - 35 miles of pipe that will likely need to be repaired or replaced in order for the pipeline to operate at its MAOP of 1,000 pounds per square inch across all segments of the Trailblazer Pipeline. Such repair or replacement will likely occur over a period of years, depending upon the remediation and repair plan implemented by Trailblazer. Segments of the Trailblazer Pipeline that require full replacement could cost as much as $2.7 million per mile and repair costs on sections of the pipeline that do not require full replacement are expected to be less on a per mile basis. The current pressure reduction is not expected to prevent Trailblazer from fulfilling its firm service obligations at existing subscription levels and to date it has not had a material adverse financial impact on us. With respect to the approximately 25 - 35 miles of pipe that has been identified, Trailblazer completed 32 excavation digs in 2015 at an aggregate cost of approximately $1.3 million . Trailblazer completed additional excavation digs and replaced approximately 8 miles of pipe at an aggregate cost of approximately $19.0 million during 2016, and intends to complete final remediation and cleanup of this pipe replacement project in 2017 at an estimated cost of $2.5 million . Trailblazer is currently exploring all possible cost recovery options to recover such out of pocket costs, including recovery through a general rate increase, negotiated rate agreements with its customers, or other FERC-approved recovery mechanisms. In connection with our acquisition of the Trailblazer Pipeline, TD agreed to contractually indemnify TEP for certain out of pocket costs related to repairing or remediating the Trailblazer Pipeline, to the extent that such actions were necessitated by external corrosion caused by the pipeline's disbonded Hi-Melt CTE coating. The contractual indemnity provided by TD was capped at $20 million and was subject to a $1.5 million deductible. TEP has received $20 million from TD pursuant to the contractual indemnity as of June 30, 2017 . Pony Express Pipeline Integrity In connection with certain crack tool runs on the Pony Express System completed in 2015 and 2016, Pony Express completed approximately $9.8 million of remediation for anomalies identified on the Pony Express System associated with the initial conversion and commissioning of portions of the pipeline converted from natural gas to crude oil service, and expects to complete additional remediation in 2017 on the Pony Express System of approximately $9 million . Terminals System Failures In January 2017, approximately 10,000 bbls of crude oil were released at the Sterling Terminal as the result of a defective roof drain system on a storage tank. The release was restricted to the containment area designed for such purpose and approximately 9,000 bbls were recovered. Remediation was complete as of June 30, 2017. The total cost to remediate the release was approximately $600,000 .

Reporting Segments

Reporting Segments	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Reporting Segments	Our operations are located in the United States. We are organized into three reportable segments: (1) Crude Oil Transportation & Logistics, (2) Natural Gas Transportation & Logistics, and (3) Processing & Logistics. Crude Oil Transportation & Logistics The Crude Oil Transportation & Logistics segment is engaged in the ownership and operation of the Pony Express System, which is a FERC-regulated crude oil pipeline serving the Bakken Shale, Denver-Julesburg and Powder River Basins, and other nearby oil producing basins. The mainline portion of the Pony Express System was placed in service in October 2014. The Pony Express System also includes a lateral pipeline in Northeast Colorado, which interconnects with the Pony Express System just east of Sterling, Colorado and was placed in service in the second quarter of 2015. The Crude Oil Transportation & Logistics segment also includes our 100% membership interest in Terminals acquired effective January 1, 2017. Natural Gas Transportation & Logistics The Natural Gas Transportation & Logistics segment is engaged in the ownership and operation of FERC-regulated interstate natural gas pipelines and an integrated natural gas storage facility that provide services to on-system customers (such as third-party LDCs), industrial users and other shippers. The Natural Gas Transportation & Logistics segment includes our 100% membership interest in NatGas acquired effective January 1, 2017 and our 49.99% membership interest in Rockies Express, including the additional 24.99% membership interest acquired effective March 31, 2017 . Processing & Logistics The Processing & Logistics segment is engaged in the ownership and operation of natural gas processing, treating and fractionation facilities that produce NGLs and residue gas that is sold in local wholesale markets or delivered into pipelines for transportation to additional end markets, as well as water business services provided primarily to the oil and gas exploration and production industry and the transportation of NGLs. The Processing & Logistics segment also includes the Douglas Gathering system acquired on June 5, 2017. Corporate and Other Corporate and Other includes corporate overhead costs that are not directly associated with the operations of our reportable segments, such as interest and fees associated with our revolving credit facilities and the 2024 Notes, public company costs, and equity-based compensation expense. These segments are monitored separately by management for performance and are consistent with internal financial reporting. These segments have been identified based on the differing products and services, regulatory environment and the expertise required for their respective operations. The following tables set forth our segment information for the periods indicated: Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Revenue Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 96,052 $ — $ 96,052 $ 93,562 $ — $ 93,562 Natural Gas Transportation & Logistics 33,110 (1,442 ) 31,668 32,142 (1,410 ) 30,732 Processing & Logistics 33,143 — 33,143 24,721 — 24,721 Corporate and Other — — — — — — Total revenue $ 162,305 $ (1,442 ) $ 160,863 $ 150,425 $ (1,410 ) $ 149,015 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 Revenue: Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 181,144 $ — $ 181,144 $ 188,216 $ — $ 188,216 Natural Gas Transportation & Logistics 69,538 (2,887 ) 66,651 64,810 (2,765 ) 62,045 Processing & Logistics 57,468 — 57,468 45,922 — 45,922 Corporate and Other — — — — — — Total revenue $ 308,150 $ (2,887 ) $ 305,263 $ 298,948 $ (2,765 ) $ 296,183 Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Operating Income: Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 51,774 $ 1,345 $ 53,119 $ 47,145 $ 1,346 $ 48,491 Natural Gas Transportation & Logistics 14,726 (1,442 ) 13,284 12,092 (1,410 ) 10,682 Processing & Logistics 5,262 97 5,359 (1,372 ) 64 (1,308 ) Corporate and Other (4,818 ) — (4,818 ) (3,107 ) — (3,107 ) Total Operating Income $ 66,944 $ — $ 66,944 $ 54,758 $ — $ 54,758 Reconciliation to Net Income: Interest expense, net (21,114 ) (10,441 ) Unrealized gain on derivative instruments — 18,953 Equity in earnings of unconsolidated investments 42,741 24,022 Other income, net 272 221 Net income before tax $ 88,843 $ 87,513 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 Operating Income: Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 96,489 $ 2,689 $ 99,178 $ 101,106 $ 2,691 $ 103,797 Natural Gas Transportation & Logistics 32,894 (2,887 ) 30,007 24,437 (2,765 ) 21,672 Processing & Logistics 9,378 198 9,576 (1,194 ) 74 (1,120 ) Corporate and Other (8,591 ) — (8,591 ) (6,146 ) — (6,146 ) Total Operating Income $ 130,170 $ — $ 130,170 $ 118,203 $ — $ 118,203 Reconciliation to Net Income: Interest expense, net (37,131 ) (19,118 ) Unrealized gain on derivative instruments 1,885 10,007 Equity in earnings of unconsolidated investments 63,479 24,731 Other income, net 342 787 Net income before tax $ 158,745 $ 134,610 Six Months Ended June 30, Capital Expenditures: 2017 2016 (in thousands) Crude Oil Transportation & Logistics $ 22,340 $ 25,529 Natural Gas Transportation & Logistics 8,368 4,115 Processing & Logistics 23,287 5,216 Corporate and Other — — Total capital expenditures $ 53,995 $ 34,860 Assets: June 30, 2017 December 31, 2016 (in thousands) Crude Oil Transportation & Logistics $ 1,483,361 $ 1,493,866 Natural Gas Transportation & Logistics 1,624,714 1,176,147 Processing & Logistics 583,963 411,999 Corporate and Other 527,150 543,468 Total assets $ 4,219,188 $ 3,625,480

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Ultra Settlement On July 12, 2017, Rockies Express received the $150 million settlement payment from Ultra as discussed in Note 14 – Legal and Environmental Matters . Acquisition of Additional Interest in Deeprock Development In July 2017, Terminals acquired an additional 49% membership interest in Deeprock Development, bringing Terminals' membership interest in Deeprock Development to 69% . On July 20, 2017, Terminals closed on the acquisition of an additional 40% membership interest in Deeprock Development from Kinder Morgan Cushing LLC for cash consideration of approximately $57.3 million . On July 21, 2017, Terminals closed the acquisition of an additional 9% membership interest in Deeprock Development from Deeprock Energy Resources LLC for total consideration valued at approximately $13.1 million , consisting of approximately $6.4 million in cash and the issuance of 128,790 common units (valued at approximately $6.7 million based on the July 20, 2017 closing price of TEP's common units).

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These condensed consolidated financial statements and related notes for the three and six months ended June 30, 2017 and 2016 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board's Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America ("GAAP") for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP for annual periods. The condensed consolidated financial statements for the three and six months ended June 30, 2017 and 2016 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair statement of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation. Our financial results for the three and six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2017 . The accompanying condensed consolidated interim financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2016 ("2016 Form 10-K") filed with the United States Securities and Exchange Commission (the "SEC") on February 15, 2017.
Consolidation	The condensed consolidated financial statements include the accounts of TEGP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net income or loss from consolidated subsidiaries that are not wholly-owned by TEGP is attributed to TEGP and noncontrolling interests in accordance with the respective ownership interests. As further discussed in Note 4 – Acquisitions , TEP closed the acquisition of Terminals and NatGas effective January 1, 2017. As the acquisitions of Terminals and NatGas are considered transactions between entities under common control, and a change in reporting entity, the financial information presented has been recast to include Terminals and NatGas for all periods presented. Net equity distributions of the Predecessor Entities included in the condensed consolidated financial statements represent transfers of cash as a result of TD's centralized cash management system prior to January 1, 2017 for Terminals and NatGas, under which cash balances were swept daily and recorded as loans from the subsidiaries of TD. These loans were then periodically recorded as equity distributions. The accompanying condensed consolidated financial statements of TEGP include historical cost-basis accounts of the assets and liabilities of the Predecessor Entities for the periods prior to January 1, 2017, the date TEP acquired Terminals and NatGas from TD, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis. TEGP, TEP, and the Predecessor Entities are all considered "entities under common control" as defined under GAAP and, as such, the transfers between the entities of the assets and liabilities have been recorded by TEGP at historical cost. A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity's economic performance. We have presented separately in our condensed consolidated balance sheets, to the extent material, the liabilities of our consolidated VIEs for which creditors do not have recourse to our general credit. Our consolidated VIEs do not have material assets that can only be used to settle specific obligations of the consolidated VIEs. Tallgrass Equity is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, we have determined that we are the primary beneficiary as we have the right to receive benefits of Tallgrass Equity that could potentially be significant to Tallgrass Equity. TEP is also considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis, we have determined that TEP GP is the primary beneficiary of TEP and we continue to consolidate TEP accordingly.
Use of Estimates	Use of Estimates Certain amounts included in or affecting these condensed consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on our business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.
Accounting Pronouncements	Accounting Pronouncement Recently Adopted ASU No. 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business" In January 2017, the FASB issued Accounting Standards Update ("ASU") No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01 clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses by providing a screen to determine when an integrated set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. The ASU also narrows the definition of the term "output" so that the term is consistent with how outputs are described under the revenue recognition guidance in Topic 606. The amendments in ASU 2017-01 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2017. Early adoption is permitted in certain circumstances. We elected to adopt the guidance in ASU 2017-01 effective April 1, 2017, and as a result applied the new guidance to transactions completed during the three months ended June 30, 2017 . ASU No. 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" In January 2017, the FASB issued ASU No. 2017-04, which simplifies the subsequent measurement of goodwill by eliminating "Step 2" from the goodwill impairment test, which involved calculating the implied fair value of goodwill by determining the fair value at the impairment testing date of a reporting unit's assets and liabilities. Instead, under the simplified test approach, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The amendments in ASU 2017-04 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We elected to adopt the guidance in ASU 2017-04 effective April 1, 2017, and as a result will apply the new guidance to our annual goodwill impairment tests to be performed as of August 31, 2017. ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Among other changes, ASU 2016-09 allows an entity to make an entity-wide accounting policy election to either estimate the number of awards expected to vest (consistent with current GAAP) or account for forfeitures when they occur. The amendments in ASU 2016-09 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2016. Early adoption is permitted. We adopted the guidance in ASU 2016-09 effective January 1, 2017 and made a policy election to account for forfeitures when they occur. The adoption of ASU 2016-09 did not have a material impact on our consolidated financial statements. Accounting Pronouncements Not Yet Adopted Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five-step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. Throughout 2015 and 2016, the FASB has issued a series of subsequent updates to the revenue recognition guidance in Topic 606, including ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers. The amendments in ASU 2014-09, ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 are effective for public entities for annual reporting periods beginning after December 15, 2017, and for interim periods within that reporting period. Early application is permitted for annual reporting periods beginning after December 15, 2016. We are currently evaluating the impact of our pending adoption of the revised guidance. The status of our implementation is as follows: • We have formed an implementation team that meets to discuss implementation challenges, technical interpretations, industry-specific treatment of certain revenue contract types, and project status. • We are currently reviewing contracts for each revenue stream identified within each of our business segments. Through this process, we are determining and documenting expected changes in revenue recognition upon adoption of the revised guidance. • We plan to evaluate the potential information technology and internal control changes that will be required for adoption based on the findings from our contract review process. • We plan to provide internal training and awareness related to the revised guidance to the key stakeholders throughout our organization. While we have tentatively concluded that the implementation of ASU 2014-09 will not have a material impact on our revenue recognition policies for a substantial number of our contracts, management has identified several areas of potential impact through the contract review process currently underway, including the accounting for non-cash consideration, particularly in our Crude Oil Transportation & Logistics and Processing & Logistics segments, and the timing of revenue recognition with respect to deficiency payments received in our Crude Oil Transportation & Logistics segment. We are currently working with an industry group to develop positions regarding these outstanding items. We are in the process of quantifying the impact of adoption, but we cannot reasonably estimate the full impact of the standard until the industry reaches consensus on these issues. We do anticipate significant changes to our disclosures based on the additional requirements prescribed by the standard. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is (or will be) recognized and data related to contract assets and liabilities. Additionally, we are currently evaluating our business processes, systems and controls to ensure the accuracy and timeliness of the recognition and disclosure requirements under the new revenue guidance. We will continue to conduct our contract review process throughout 2017 and, as a result, additional areas of impact may be identified. We expect to adopt the new standard on January 1, 2018 using the modified retrospective approach. This approach allows us to apply the new standard to (i) all new contracts entered into after January 1, 2018 and (ii) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to equity. Consolidated revenues presented in our comparative financial statements for periods prior to January 1, 2018 would not be revised. ASU No. 2016-02, "Leases (Topic 842)" In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU 2016-02 provides a comprehensive update to the lease accounting topic in the Codification intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in ASU 2016-02 include a revised definition of a lease as well as certain scope exceptions. The changes primarily impact lessee accounting, while lessor accounting is largely unchanged from previous GAAP. The amendments in ASU 2016-02 are effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within that reporting period. Early application is permitted. We are currently evaluating the impact of ASU 2016-02.

Acquisitions Equity Method Inve

Acquisitions Equity Method Investments (Policies)	6 Months Ended
	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments, Policy	TEP's investment in Rockies Express is recorded under the equity method of accounting and is reported as "Unconsolidated investments" on our condensed consolidated balance sheets. As a result of the common control nature of the transaction, the 24.99% membership interest in Rockies Express was transferred to TEP at TD's historical carrying amount, including the remaining unamortized basis difference driven by the difference between the fair value of the investment and the book value of the underlying assets and liabilities on November 13, 2012, the date of acquisition by TD. For additional information, see Note 8 – Investments in Unconsolidated Affiliates . As of March 31, 2017, the negative basis difference carried over from TD was approximately $386.8 million . The amount of the basis difference allocated to property, plant and equipment is accreted over 35 years , which equates to the 2.86% composite depreciation rate utilized by Rockies Express to depreciate the underlying property, plant and equipment. The amount allocated to long-term debt is amortized over the remaining life of the various debt facilities.

Acquisitions Business Combinati

Acquisitions Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Equity Method Investments	The basis difference associated with the recently acquired 24.99% membership interest in Rockies Express at June 30, 2017 was allocated as follows: Basis Difference Amortization Period (in thousands) Long-term debt $ 19,291 2 - 25 years Property, plant and equipment (402,984 ) 35 years Total basis difference $ (383,693 ) Summarized financial information for Rockies Express is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Revenue $ 207,149 $ 175,350 $ 408,487 $ 391,902 Operating income $ 112,703 $ 85,352 $ 220,072 $ 201,411 Net income to Members $ 70,945 $ 112,728 $ 137,195 $ 192,663
Impact of Adjustments Related to Transaction Among Entities Under Common Control, Balance Sheet [Table Text Block]	The results of our acquisitions of Terminals and NatGas are included in the condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016 . The following table presents our previously reported December 31, 2016 condensed consolidated balance sheet, adjusted for the acquisitions of Terminals and NatGas: December 31, 2016 TEGP (As previously reported) Consolidate Terminals Consolidate NatGas TEGP (As currently reported) (in thousands) ASSETS Current Assets: Cash and cash equivalents $ 2,459 $ — $ — $ 2,459 Accounts receivable, net 59,469 38 29 59,536 Gas imbalances 1,597 — — 1,597 Inventories 12,805 288 — 13,093 Derivative assets 10,967 — — 10,967 Prepayments and other current assets 6,820 808 — 7,628 Total Current Assets 94,117 1,134 29 95,280 Property, plant and equipment, net 2,012,263 66,969 — 2,079,232 Goodwill 343,288 — — 343,288 Intangible asset, net 93,522 — — 93,522 Unconsolidated investments 461,915 13,710 — 475,625 Deferred tax asset 521,454 — — 521,454 Deferred financing costs, net 6,042 — — 6,042 Deferred charges and other assets 9,637 1,400 — 11,037 Total Assets $ 3,542,238 $ 83,213 $ 29 $ 3,625,480 LIABILITIES AND EQUITY Current Liabilities: Accounts payable $ 24,403 $ 46 $ — $ 24,449 Accounts payable to related parties 5,768 56 — 5,824 Gas imbalances 1,239 — — 1,239 Derivative liabilities 556 — — 556 Accrued taxes 16,328 668 — 16,996 Accrued liabilities 16,578 177 — 16,755 Deferred revenue 60,757 — — 60,757 Other current liabilities 6,446 — — 6,446 Total Current Liabilities 132,075 947 — 133,022 Long-term debt, net 1,555,981 — — 1,555,981 Other long-term liabilities and deferred credits 7,063 — — 7,063 Total Long-term Liabilities 1,563,044 — — 1,563,044 Equity: Net Equity 1,847,119 82,266 29 1,929,414 Total Equity 1,847,119 82,266 29 1,929,414 Total Liabilities and Equity $ 3,542,238 $ 83,213 $ 29 $ 3,625,480
Impact of Adjustments Related to Transaction Among Entities Under Common Control, Income Statement [Table Text Block]	The results of our acquisitions of Terminals and NatGas are included in the condensed consolidated statements of income for the three and six months ended June 30, 2017 and 2016 . The following tables present the previously reported condensed consolidated statements of income for the three and six months ended June 30, 2016 , adjusted for the acquisitions of Terminals and NatGas: Three Months Ended June 30, 2016 TEGP (As previously reported) Consolidate Terminals Consolidate NatGas Elimination (1) TEGP (As currently reported) (in thousands) Revenues: Crude oil transportation services $ 93,322 $ — $ — $ — $ 93,322 Natural gas transportation services 28,682 — — — 28,682 Sales of natural gas, NGLs, and crude oil 16,830 — — — 16,830 Processing and other revenues 8,097 2,957 1,992 (2,865 ) 10,181 Total Revenues 146,931 2,957 1,992 (2,865 ) 149,015 Operating Costs and Expenses: Cost of sales (exclusive of depreciation and amortization shown below) 15,958 — — — 15,958 Cost of transportation services (exclusive of depreciation and amortization shown below) 14,240 200 — (2,865 ) 11,575 Operations and maintenance 13,864 406 — — 14,270 Depreciation and amortization 21,576 314 — — 21,890 General and administrative 14,458 413 — — 14,871 Taxes, other than income taxes 5,639 144 — — 5,783 Contract termination — 8,061 (2) — — 8,061 Loss on disposal of assets 1,849 — — — 1,849 Total Operating Costs and Expenses 87,584 9,538 — (2,865 ) 94,257 Operating Income (Loss) 59,347 (6,581 ) 1,992 — 54,758 Other Income (Expense): Interest expense, net (10,441 ) — — — (10,441 ) Unrealized gain on derivative instrument 18,953 — — — 18,953 Equity in earnings of unconsolidated investments 23,321 701 — — 24,022 Other income, net 221 — — — 221 Total Other Income 32,054 701 — — 32,755 Net income (loss) before tax 91,401 (5,880 ) 1,992 — 87,513 Deferred income tax expense (6,792 ) — — — (6,792 ) Net income (loss) 84,609 (5,880 ) 1,992 — 80,721 Net income attributable to noncontrolling interests (81,161 ) — — — (81,161 ) Net income (loss) attributable to TEGP $ 3,448 $ (5,880 ) $ 1,992 $ — $ (440 ) Six Months Ended June 30, 2016 TEGP (As previously reported) Consolidate Terminals Consolidate NatGas Elimination (1) TEGP (As currently reported) (in thousands) Revenues: Crude oil transportation services $ 187,894 $ — $ — $ — $ 187,894 Natural gas transportation services 57,962 — — — 57,962 Sales of natural gas, NGLs, and crude oil 30,756 — — — 30,756 Processing and other revenues 15,724 5,866 3,673 (5,692 ) 19,571 Total Revenues 292,336 5,866 3,673 (5,692 ) 296,183 Operating Costs and Expenses: Cost of sales (exclusive of depreciation and amortization shown below) 29,526 — — — 29,526 Cost of transportation services (exclusive of depreciation and amortization shown below) 30,396 400 — (5,692 ) 25,104 Operations and maintenance 26,341 887 — — 27,228 Depreciation and amortization 43,268 629 — — 43,897 General and administrative 27,995 887 — — 28,882 Taxes, other than income taxes 13,145 288 — — 13,433 Contract termination — 8,061 (2) — — 8,061 Loss on disposal of assets 1,849 — — — 1,849 Total Operating Costs and Expenses 172,520 11,152 — (5,692 ) 177,980 Operating Income (Loss) 119,816 (5,286 ) 3,673 — 118,203 Other Income (Expense): Interest expense, net (19,118 ) — — — (19,118 ) Unrealized gain on derivative instrument 10,007 — — — 10,007 Equity in earnings of unconsolidated investments 23,321 1,410 — — 24,731 Other income, net 787 — — — 787 Total Other Income 14,997 1,410 — — 16,407 Net income (loss) before tax 134,813 (3,876 ) 3,673 — 134,610 Deferred income tax expense (9,583 ) — — — (9,583 ) Net income (loss) 125,230 (3,876 ) 3,673 — 125,027 Net income attributable to noncontrolling interests (114,193 ) — — — (114,193 ) Net income (loss) attributable to TEGP $ 11,037 $ (3,876 ) $ 3,673 $ — $ 10,834 (1) Represents the elimination of revenue and cost of transportation services associated with the lease of the Sterling Terminal facilities by Pony Express. (2) Represents a one-time charge related to the termination of an operating agreement at the Sterling Terminal.

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Schedule of Transactions with Affiliated Companies	Totals of transactions with affiliated companies, excluding transactions disclosed elsewhere in these notes, are as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Cost of transportation services (1) $ 4,907 $ 4,829 $ 9,414 $ 9,258 Charges to TEGP: (2) Property, plant and equipment, net $ 510 $ 649 $ 803 $ 1,567 Operations and maintenance $ 7,430 $ 6,373 $ 13,707 $ 12,557 General and administrative $ 11,095 $ 10,206 $ 20,668 $ 19,643 (1) Reflects rent expense for the crude oil storage at the Deeprock Terminal. (2) Charges to TEGP, inclusive of Tallgrass Equity and TEP, include directly charged wages and salaries, other compensation and benefits, and shared services.
Schedule of Balances with Affiliates Included in Accounts Receivables and Accounts Payable in Consolidated Balance Sheets	Details of balances with affiliates included in "Accounts receivable, net" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows: June 30, 2017 December 31, 2016 (in thousands) Receivable from related parties: Rockies Express Pipeline LLC $ 1,029 $ 590 Total receivable from related parties $ 1,029 $ 590 Accounts payable to related parties: Tallgrass Operations, LLC $ 5,778 $ 5,811 Deeprock Development, LLC — 13 Total accounts payable to related parties $ 5,778 $ 5,824
Schedule of Balances of Gas Imbalance with Affiliated Shippers	Gas imbalances with affiliated shippers are as follows: June 30, 2017 December 31, 2016 (in thousands) Affiliate gas imbalance receivables $ — $ 177 Affiliate gas imbalance payables $ 205 $ —

Inventory (Tables)

Inventory (Tables)	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Schedule of Components of Inventory	The components of inventory at June 30, 2017 and December 31, 2016 consisted of the following: June 30, 2017 December 31, 2016 (in thousands) Crude oil $ 2,909 $ 5,462 Materials and supplies 6,366 6,383 Natural gas liquids 413 265 Gas in underground storage 1,553 983 Total inventory $ 11,241 $ 13,093

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Components of Property Plant and Equipment	A summary of net property, plant and equipment by classification is as follows: June 30, 2017 December 31, 2016 (in thousands) Crude oil pipelines $ 1,218,337 $ 1,202,125 Natural gas pipelines 572,749 572,150 Gathering, processing and treating assets (1) 401,186 256,901 General and other 253,508 223,310 Construction work in progress 22,513 20,606 Accumulated depreciation and amortization (235,539 ) (195,860 ) Total property, plant and equipment, net $ 2,232,754 $ 2,079,232 (1) Includes approximately $138.2 million of assets associated with the Douglas Gathering System acquired in June 2017.

Investments in Unconsolidated29

Investments in Unconsolidated Affiliates (Tables)	6 Months Ended
	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	The basis difference associated with the recently acquired 24.99% membership interest in Rockies Express at June 30, 2017 was allocated as follows: Basis Difference Amortization Period (in thousands) Long-term debt $ 19,291 2 - 25 years Property, plant and equipment (402,984 ) 35 years Total basis difference $ (383,693 ) Summarized financial information for Rockies Express is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Revenue $ 207,149 $ 175,350 $ 408,487 $ 391,902 Operating income $ 112,703 $ 85,352 $ 220,072 $ 201,411 Net income to Members $ 70,945 $ 112,728 $ 137,195 $ 192,663

Risk Management (Tables)

Risk Management (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative Contracts	The following table summarizes the fair values of our derivative contracts included in the condensed consolidated balance sheets: Balance Sheet June 30, 2017 December 31, 2016 (in thousands) Crude oil derivative contracts (1) Current assets $ 207 $ — Natural gas derivative contracts (2) Current assets $ 13 $ 291 Call option derivative (3) Current assets $ — $ 10,676 Crude oil derivative contracts (1) Current liabilities $ — $ 440 Natural gas derivative contracts (2) Current liabilities $ — $ 116 (1) The fair value shown for crude oil derivative contracts represents the sale of 30,000 barrels and 125,000 barrels of crude oil as of June 30, 2017 and December 31, 2016 , respectively, which will settle throughout 2017. (2) As of June 30, 2017 , the fair value shown for natural gas derivative contracts was comprised of derivative volumes for long natural gas fixed-price swaps totaling 0.2 Bcf. As of December 31, 2016 , the fair value shown for natural gas derivative contracts was comprised of derivative volumes for short and long natural gas fixed-price swaps totaling 0.3 Bcf and 0.4 Bcf, respectively. (3) As discussed below, in conjunction with TEP's acquisition of an additional 31.3% membership interest in Pony Express effective January 1, 2016, TD granted TEP an 18 month call option covering the 6,518,000 common units issued to TD. As of February 1, 2017, no common units remained subject to the call option.
Derivative Contracts Included in Consolidated Statements of Income	The following table summarizes the impact of derivative contracts not designated as hedging contracts for the three and six months ended June 30, 2017 and 2016 : Contract Type Location of gain (loss) recognized Amount of gain (loss) recognized in income on derivatives Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Crude oil derivative contracts Sales of natural gas, NGLs, and crude oil $ 227 $ 148 $ 890 $ 148 Natural gas derivative contracts Sales of natural gas, NGLs, and crude oil $ (67 ) $ (307 ) $ 106 $ (351 ) Call option derivative Unrealized gain on derivative instrument $ — $ 18,953 $ 1,885 $ 10,007
Derivative Instruments Maximum Potential Exposure to Credit Loss [Table Text Block]	The maximum potential exposure to credit losses on our crude oil and natural gas derivative contracts at June 30, 2017 was: Asset Position (in thousands) Gross $ 220 Netting agreement impact — Cash collateral held — Net exposure $ 220
Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification	The following table summarizes the fair value measurements of our derivative contracts as of June 30, 2017 and December 31, 2016 based on the fair value hierarchy: Asset Fair Value Measurements Using Total Quoted prices in Significant Significant (in thousands) As of June 30, 2017: Crude oil derivative contracts $ 207 $ — $ 207 $ — Natural gas derivative contracts $ 13 $ — $ 13 $ — As of December 31, 2016: Call option derivative $ 10,676 $ — $ 10,676 $ — Natural gas derivative contracts $ 291 $ — $ 291 $ — Liability Fair Value Measurements Using Total Quoted prices in Significant Significant (in thousands) As of December 31, 2016: Crude oil derivative contracts $ 440 $ — $ 440 $ — Natural gas derivative contracts $ 116 $ — $ 116 $ —

Long-term Debt (Tables)

Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Line of Credit Facility [Line Items]
Schedule of Debt	Long-term debt consisted of the following at June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 (in thousands) Tallgrass Equity revolving credit facility $ 147,000 $ 148,000 TEP revolving credit facility 1,348,000 1,015,000 TEP 5.50% senior notes due September 15, 2024 750,000 400,000 Less: Deferred financing costs, net (1) (10,432 ) (7,019 ) Total long-term debt, net $ 2,234,568 $ 1,555,981 (1) Deferred financing costs, net as presented above relate solely to the 2024 Notes. Deferred financing costs associated with our revolving credit facilities are presented in noncurrent assets on our condensed consolidated balance sheets.
Carrying Amount and Fair value of Long-term Debt	The following table sets forth the carrying amount and fair value of our long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016 , but for which fair value is disclosed: Fair Value Quoted prices Significant Significant Total Carrying (in thousands) As of June 30, 2017: Revolving credit facilities $ — $ 1,495,000 $ — $ 1,495,000 $ 1,495,000 2024 Notes $ — $ 763,695 $ — $ 763,695 $ 739,568 As of December 31, 2016: Revolving credit facilities $ — $ 1,163,000 $ — $ 1,163,000 $ 1,163,000 2024 Notes $ — $ 398,000 $ — $ 398,000 $ 392,981
Tallgrass Equity, LLC
Line of Credit Facility [Line Items]
Schedule of Line of Credit Facilities	The following table sets forth the available borrowing capacity under the Tallgrass Equity revolving credit facility as of June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 (in thousands) Total capacity under Tallgrass Equity revolving credit facility $ 150,000 $ 150,000 Less: Outstanding borrowings under the Tallgrass Equity revolving credit facility (147,000 ) (148,000 ) Available capacity under the Tallgrass Equity revolving credit facility $ 3,000 $ 2,000
Tallgrass Energy Partners
Line of Credit Facility [Line Items]
Schedule of Line of Credit Facilities	The following table sets forth the available borrowing capacity under the TEP revolving credit facility as of June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 (in thousands) Total capacity under the TEP revolving credit facility $ 1,750,000 $ 1,750,000 Less: Outstanding borrowings under the TEP revolving credit facility (1,348,000 ) (1,015,000 ) Less: Letters of credit issued under the TEP revolving credit facility (60 ) — Available capacity under the TEP revolving credit facility $ 401,940 $ 735,000

Partnership Equity and Distri32

Partnership Equity and Distributions Partnership and Equity and Distributions (Tables)	6 Months Ended
	Jun. 30, 2017
Tallgrass Energy GP, LP
Summary of Distributions	The following table details the distributions for the periods indicated: Three Months Ended Date Paid Distributions to Class A Shareholders Distributions per Class A Share (in thousands) June 30, 2017 August 14, 2017 (1) $ 19,891 $ 0.3425 March 31, 2017 May 15, 2017 16,697 0.2875 December 31, 2016 February 14, 2017 16,116 0.2775 September 30, 2016 November 14, 2016 12,528 0.2625 June 30, 2016 August 12, 2016 11,693 0.2450 March 31, 2016 May 13, 2016 10,022 0.2100 (1) The distribution announced on July 5, 2017 for the second quarter of 2017 will be paid on August 14, 2017 to Class A shareholders of record at the close of business on July 28, 2017 .
Tallgrass Energy Partners
Summary of Distributions	TEP Distributions . The following table shows the distributions for the periods indicated: Distributions Limited Partner General Partner Distributions Three Months Ended Date Paid Incentive Distribution Rights General Partner Units Total (in thousands, except per unit amounts) June 30, 2017 August 14, 2017 (1) $ 67,671 $ 36,342 $ 1,186 $ 105,199 $ 0.9250 March 31, 2017 May 15, 2017 60,486 29,840 1,040 91,366 0.8350 December 31, 2016 February 14, 2017 58,793 28,358 1,008 88,159 0.8150 September 30, 2016 November 14, 2016 57,332 26,987 976 85,295 0.7950 June 30, 2016 August 12, 2016 54,442 24,262 911 79,615 0.7550 March 31, 2016 May 13, 2016 48,238 19,816 830 68,884 0.7050 (1) The distribution announced on July 5, 2017 for the second quarter of 2017 will be paid on August 14, 2017 to unitholders of record at the close of business on July 28, 2017 .

Net Income per Class A Share 33

Net Income per Class A Share Net Income per Class A Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Summary of Net Income per Class A Share	The following table illustrates the calculation of net income per Class A share for the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands, except per share data) Basic Net Income per Class A Share Net income attributable to TEGP, excluding predecessor operations interest $ 8,753 $ 3,448 $ 20,782 $ 11,037 Basic weighted average Class A Shares outstanding 58,075 47,725 58,075 47,725 Basic net income per Class A share $ 0.15 $ 0.07 $ 0.36 $ 0.23 Diluted Net Income per Class A Share Net income attributable to TEGP, excluding predecessor operations interest $ 8,753 $ 3,448 $ 20,782 $ 11,037 Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares 38 1 64 — Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares $ 8,791 $ 3,449 $ 20,846 $ 11,037 Basic weighted average Class A Shares outstanding 58,075 47,725 58,075 47,725 Equity Participation Shares equivalent shares 117 9 112 — Diluted weighted average Class A Shares outstanding 58,192 47,734 58,187 47,725 Diluted net income per Class A Share $ 0.15 $ 0.07 $ 0.36 $ 0.23

Reporting Segments (Tables)

Reporting Segments (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Summary of TEGP's Segment Information of Revenue	The following tables set forth our segment information for the periods indicated: Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Revenue Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 96,052 $ — $ 96,052 $ 93,562 $ — $ 93,562 Natural Gas Transportation & Logistics 33,110 (1,442 ) 31,668 32,142 (1,410 ) 30,732 Processing & Logistics 33,143 — 33,143 24,721 — 24,721 Corporate and Other — — — — — — Total revenue $ 162,305 $ (1,442 ) $ 160,863 $ 150,425 $ (1,410 ) $ 149,015 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 Revenue: Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 181,144 $ — $ 181,144 $ 188,216 $ — $ 188,216 Natural Gas Transportation & Logistics 69,538 (2,887 ) 66,651 64,810 (2,765 ) 62,045 Processing & Logistics 57,468 — 57,468 45,922 — 45,922 Corporate and Other — — — — — — Total revenue $ 308,150 $ (2,887 ) $ 305,263 $ 298,948 $ (2,765 ) $ 296,183
Summary of TEGP's Segment Information of Earnings	Three Months Ended June 30, 2017 Three Months Ended June 30, 2016 Operating Income: Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 51,774 $ 1,345 $ 53,119 $ 47,145 $ 1,346 $ 48,491 Natural Gas Transportation & Logistics 14,726 (1,442 ) 13,284 12,092 (1,410 ) 10,682 Processing & Logistics 5,262 97 5,359 (1,372 ) 64 (1,308 ) Corporate and Other (4,818 ) — (4,818 ) (3,107 ) — (3,107 ) Total Operating Income $ 66,944 $ — $ 66,944 $ 54,758 $ — $ 54,758 Reconciliation to Net Income: Interest expense, net (21,114 ) (10,441 ) Unrealized gain on derivative instruments — 18,953 Equity in earnings of unconsolidated investments 42,741 24,022 Other income, net 272 221 Net income before tax $ 88,843 $ 87,513 Six Months Ended June 30, 2017 Six Months Ended June 30, 2016 Operating Income: Total Inter- External Total Inter- External (in thousands) Crude Oil Transportation & Logistics $ 96,489 $ 2,689 $ 99,178 $ 101,106 $ 2,691 $ 103,797 Natural Gas Transportation & Logistics 32,894 (2,887 ) 30,007 24,437 (2,765 ) 21,672 Processing & Logistics 9,378 198 9,576 (1,194 ) 74 (1,120 ) Corporate and Other (8,591 ) — (8,591 ) (6,146 ) — (6,146 ) Total Operating Income $ 130,170 $ — $ 130,170 $ 118,203 $ — $ 118,203 Reconciliation to Net Income: Interest expense, net (37,131 ) (19,118 ) Unrealized gain on derivative instruments 1,885 10,007 Equity in earnings of unconsolidated investments 63,479 24,731 Other income, net 342 787 Net income before tax $ 158,745 $ 134,610
Summary of TEGP's Segment Capital Expenditures	Six Months Ended June 30, Capital Expenditures: 2017 2016 (in thousands) Crude Oil Transportation & Logistics $ 22,340 $ 25,529 Natural Gas Transportation & Logistics 8,368 4,115 Processing & Logistics 23,287 5,216 Corporate and Other — — Total capital expenditures $ 53,995 $ 34,860
Summary of TEGP's Segment Information of Assets	Assets: June 30, 2017 December 31, 2016 (in thousands) Crude Oil Transportation & Logistics $ 1,483,361 $ 1,493,866 Natural Gas Transportation & Logistics 1,624,714 1,176,147 Processing & Logistics 583,963 411,999 Corporate and Other 527,150 543,468 Total assets $ 4,219,188 $ 3,625,480

Description of Business - Addit

Description of Business - Additional Information (Detail) - shares	Aug. 02, 2017	Jun. 30, 2017	Jul. 21, 2017	Mar. 31, 2017	Jan. 01, 2017
Rockies Express Pipeline LLC
Organization [Line Items]
Equity Method Investment, Ownership Percentage		49.99%
Tallgrass Terminals, LLC
Organization [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Rockies Express Pipeline LLC | Tallgrass Development LP
Organization [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				24.99%
Tallgrass NatGas Operator, LLC
Organization [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Tallgrass Equity, LLC
Organization [Line Items]
Variable Interest Entity, Ownership Percentage		36.94%
Tallgrass MLP GP, LLC
Organization [Line Items]
Limited Liability Company (LLC) or General Partner, Ownership Interest		100.00%
Tallgrass Energy Partners
Organization [Line Items]
Limited Liability Company (LLC) or General Partner, Ownership Interest		1.13%
General partner units issued		834,391
Subsidiary Of Limited Liability Company Or Limited Partnership Ownership Interest Units		20,000,000
Ownership Percentage Of Aggregate Partnership Equity, Including General Partner Units		27.08%
Subsequent Event | Deeprock Development, LLC
Organization [Line Items]
Ownership Percentage Of Aggregate Partnership Equity, Including General Partner Units	69.00%
Business Acquisition, Percentage of Voting Interests Acquired			49.00%

Variable Interest Entity VIE As

Variable Interest Entity VIE Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred tax asset	$ 509,114	$ 521,454

Acquisitions Equity Method In37

Acquisitions Equity Method Investments (Details) - Rockies Express Pipeline LLC $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ (383,693)
Basis Difference, Amortization Period	35 years
Long-term Debt
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 19,291
Property, Plant and Equipment
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ (402,984)
Basis Difference, Amortization Period	35 years
Minimum | Long-term Debt
Schedule of Equity Method Investments [Line Items]
Basis Difference, Amortization Period	2 years
Maximum | Long-term Debt
Schedule of Equity Method Investments [Line Items]
Basis Difference, Amortization Period	25 years

Acquisitions Impact of Acquisit

Acquisitions Impact of Acquisition, Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Cash and cash equivalents	$ 873	$ 2,459	$ 2,623	$ 2,234
Accounts receivable, net	58,157	59,536
Gas imbalances	650	1,597
Inventories	11,241	13,093
Derivative assets	220	10,967
Prepayments and other current assets	7,153	7,628
Total Current Assets	78,294	95,280
Property, plant and equipment, net	2,232,754	2,079,232
Goodwill	343,288	343,288
Intangible asset, net	93,258	93,522
Unconsolidated investments	936,939	475,625
Deferred tax asset	509,114	521,454
Deferred financing costs, net	14,179	6,042
Deferred charges and other assets	11,362	11,037
Total Assets	4,219,188	3,625,480
Accounts payable	24,227	24,449
Accounts payable to related parties	5,778	5,824
Gas imbalances	1,281	1,239
Derivative liabilities	0	556
Accrued taxes	17,246	16,996
Accrued liabilities	18,662	16,755
Deferred revenue	85,566	60,757
Other current liabilities	5,292	6,446
Total Current Liabilities	158,052	133,022
Long-term debt, net	2,234,568	1,555,981
Other long-term liabilities and deferred credits	17,200	7,063
Total Long-term Liabilities	2,251,768	1,563,044
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	1,809,368	1,929,414
Total Liabilities and Equity	$ 4,219,188	3,625,480
Tallgrass Energy GP, LP
Business Acquisition [Line Items]
Cash and cash equivalents		2,459
Accounts receivable, net		59,469
Gas imbalances		1,597
Inventories		12,805
Derivative assets		10,967
Prepayments and other current assets		6,820
Total Current Assets		94,117
Property, plant and equipment, net		2,012,263
Goodwill		343,288
Intangible asset, net		93,522
Unconsolidated investments		461,915
Deferred tax asset		521,454
Deferred financing costs, net		6,042
Deferred charges and other assets		9,637
Total Assets		3,542,238
Accounts payable		24,403
Accounts payable to related parties		5,768
Gas imbalances		1,239
Derivative liabilities		556
Accrued taxes		16,328
Accrued liabilities		16,578
Deferred revenue		60,757
Other current liabilities		6,446
Total Current Liabilities		132,075
Long-term debt, net		1,555,981
Other long-term liabilities and deferred credits		7,063
Total Long-term Liabilities		1,563,044
Partners' Capital, Including Portion Attributable to Noncontrolling Interest		1,847,119
Total Liabilities and Equity		3,542,238
Tallgrass Terminals, LLC
Business Acquisition [Line Items]
Cash and cash equivalents		0
Accounts receivable, net		38
Gas imbalances		0
Inventories		288
Derivative assets		0
Prepayments and other current assets		808
Total Current Assets		1,134
Property, plant and equipment, net		66,969
Goodwill		0
Intangible asset, net		0
Unconsolidated investments		13,710
Deferred tax asset		0
Deferred financing costs, net		0
Deferred charges and other assets		1,400
Total Assets		83,213
Accounts payable		46
Accounts payable to related parties		56
Gas imbalances		0
Derivative liabilities		0
Accrued taxes		668
Accrued liabilities		177
Deferred revenue		0
Other current liabilities		0
Total Current Liabilities		947
Long-term debt, net		0
Other long-term liabilities and deferred credits		0
Total Long-term Liabilities		0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest		82,266
Total Liabilities and Equity		83,213
Tallgrass NatGas Operator, LLC
Business Acquisition [Line Items]
Cash and cash equivalents		0
Accounts receivable, net		29
Gas imbalances		0
Inventories		0
Derivative assets		0
Prepayments and other current assets		0
Total Current Assets		29
Property, plant and equipment, net		0
Goodwill		0
Intangible asset, net		0
Unconsolidated investments		0
Deferred tax asset		0
Deferred financing costs, net		0
Deferred charges and other assets		0
Total Assets		29
Accounts payable		0
Accounts payable to related parties		0
Gas imbalances		0
Derivative liabilities		0
Accrued taxes		0
Accrued liabilities		0
Deferred revenue		0
Other current liabilities		0
Total Current Liabilities		0
Long-term debt, net		0
Other long-term liabilities and deferred credits		0
Total Long-term Liabilities		0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest		29
Total Liabilities and Equity		$ 29

Acquisitions Impact of Acquis39

Acquisitions Impact of Acquisition, Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Crude oil transportation services	$ 89,855	$ 93,322	$ 174,186	$ 187,894
Natural gas transportation services	29,429	28,682	61,114	57,962
Sales of natural gas, NGLs, and crude oil	22,918	16,830	38,299	30,756
Processing and other revenues	18,661	10,181	31,664	19,571
Total Revenues	160,863	149,015	305,263	296,183
Cost of sales (exclusive of depreciation and amortization shown below)	19,386	15,958	31,756	29,526
Cost of transportation services (exclusive of depreciation and amortization shown below)	14,758	11,575	28,261	25,104
Operations and maintenance	15,254	14,270	28,157	27,228
Depreciation and amortization	22,091	21,890	43,494	43,897
General and administrative	15,334	14,871	29,551	28,882
Taxes, other than income taxes	6,912	5,783	15,138	13,433
Contract termination	0	8,061	0	8,061
Loss (gain) on disposal of assets	184	1,849	(1,264)	1,849
Total Operating Costs and Expenses	93,919	94,257	175,093	177,980
Operating Income	66,944	54,758	130,170	118,203
Interest expense, net	(21,114)	(10,441)	(37,131)	(19,118)
Unrealized gain on derivative instrument	0	18,953	1,885	10,007
Equity in earnings of unconsolidated investments	42,741	24,022	63,479	24,731
Other income, net	272	221	342	787
Total Other Income (Expense)	21,899	32,755	28,575	16,407
Net income before tax	88,843	87,513	158,745	134,610
Deferred income tax expense		(6,792)		(9,583)
Net income	79,167	80,721	146,405	125,027
Net income attributable to noncontrolling interests	(70,414)	(81,161)	(125,623)	(114,193)
Net Income (Loss) Attributable to Parent	$ 8,753	(440)	$ 20,782	10,834
Consolidation, Eliminations
Business Acquisition [Line Items]
Crude oil transportation services		0		0
Natural gas transportation services		0		0
Sales of natural gas, NGLs, and crude oil		0		0
Processing and other revenues		(2,865)		(5,692)
Total Revenues		(2,865)		(5,692)
Cost of sales (exclusive of depreciation and amortization shown below)		0		0
Cost of transportation services (exclusive of depreciation and amortization shown below)		(2,865)		(5,692)
Operations and maintenance		0		0
Depreciation and amortization		0		0
General and administrative		0		0
Taxes, other than income taxes		0		0
Contract termination		0		0
Loss (gain) on disposal of assets		0		0
Total Operating Costs and Expenses		(2,865)		(5,692)
Operating Income		0		0
Interest expense, net		0		0
Unrealized gain on derivative instrument		0		0
Equity in earnings of unconsolidated investments		0		0
Other income, net		0		0
Total Other Income (Expense)		0		0
Net income before tax		0		0
Deferred income tax expense		0		0
Net income		0		0
Net income attributable to noncontrolling interests		0		0
Net Income (Loss) Attributable to Parent		0		0
Tallgrass Energy GP, LP
Business Acquisition [Line Items]
Crude oil transportation services		93,322		187,894
Natural gas transportation services		28,682		57,962
Sales of natural gas, NGLs, and crude oil		16,830		30,756
Processing and other revenues		8,097		15,724
Total Revenues		146,931		292,336
Cost of sales (exclusive of depreciation and amortization shown below)		15,958		29,526
Cost of transportation services (exclusive of depreciation and amortization shown below)		14,240		30,396
Operations and maintenance		13,864		26,341
Depreciation and amortization		21,576		43,268
General and administrative		14,458		27,995
Taxes, other than income taxes		5,639		13,145
Contract termination		0		0
Loss (gain) on disposal of assets		1,849		1,849
Total Operating Costs and Expenses		87,584		172,520
Operating Income		59,347		119,816
Interest expense, net		(10,441)		(19,118)
Unrealized gain on derivative instrument		18,953		10,007
Equity in earnings of unconsolidated investments		23,321		23,321
Other income, net		221		787
Total Other Income (Expense)		32,054		14,997
Net income before tax		91,401		134,813
Deferred income tax expense		(6,792)		(9,583)
Net income		84,609		125,230
Net income attributable to noncontrolling interests		(81,161)		(114,193)
Net Income (Loss) Attributable to Parent		3,448		11,037
Tallgrass Terminals, LLC
Business Acquisition [Line Items]
Crude oil transportation services		0		0
Natural gas transportation services		0		0
Sales of natural gas, NGLs, and crude oil		0		0
Processing and other revenues		2,957		5,866
Total Revenues		2,957		5,866
Cost of sales (exclusive of depreciation and amortization shown below)		0		0
Cost of transportation services (exclusive of depreciation and amortization shown below)		200		400
Operations and maintenance		406		887
Depreciation and amortization		314		629
General and administrative		413		887
Taxes, other than income taxes		144		288
Contract termination		8,061		8,061
Loss (gain) on disposal of assets		0		0
Total Operating Costs and Expenses		9,538		11,152
Operating Income		(6,581)		(5,286)
Interest expense, net		0		0
Unrealized gain on derivative instrument		0		0
Equity in earnings of unconsolidated investments		701		1,410
Other income, net		0		0
Total Other Income (Expense)		701		1,410
Net income before tax		(5,880)		(3,876)
Deferred income tax expense		0		0
Net income		(5,880)		(3,876)
Net income attributable to noncontrolling interests		0		0
Net Income (Loss) Attributable to Parent		(5,880)		(3,876)
Tallgrass NatGas Operator, LLC
Business Acquisition [Line Items]
Crude oil transportation services		0		0
Natural gas transportation services		0		0
Sales of natural gas, NGLs, and crude oil		0		0
Processing and other revenues		1,992		3,673
Total Revenues		1,992		3,673
Cost of sales (exclusive of depreciation and amortization shown below)		0		0
Cost of transportation services (exclusive of depreciation and amortization shown below)		0		0
Operations and maintenance		0		0
Depreciation and amortization		0		0
General and administrative		0		0
Taxes, other than income taxes		0		0
Contract termination		0		0
Loss (gain) on disposal of assets		0		0
Total Operating Costs and Expenses		0		0
Operating Income		1,992		3,673
Interest expense, net		0		0
Unrealized gain on derivative instrument		0		0
Equity in earnings of unconsolidated investments		0		0
Other income, net		0		0
Total Other Income (Expense)		0		0
Net income before tax		1,992		3,673
Deferred income tax expense		0		0
Net income		1,992		3,673
Net income attributable to noncontrolling interests		0		0
Net Income (Loss) Attributable to Parent		$ 1,992		$ 3,673

Acquisitions (Details)

Acquisitions (Details) $ in Thousands	Jul. 21, 2017USD ($)	Jul. 20, 2017USD ($)	Jun. 05, 2017USD ($)mi	Mar. 31, 2017USD ($)	Jan. 01, 2017USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	May 06, 2016
Business Acquisition [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates						$ 400,000	$ 436,022
Acquisition of Douglas Gathering System						128,526	0
Payments to Acquire Businesses, Gross						$ 140,000	$ 0
DCP Douglas
Business Acquisition [Line Items]
Miles of gathering pipeline | mi			1,500
DCP Douglas | Tallgrass Energy Partners
Business Acquisition [Line Items]
Acquisition of Douglas Gathering System			$ 128,500
Rockies Express Pipeline LLC | Tallgrass Energy Partners
Business Acquisition [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates				$ 400,000
Tallgrass Terminals, LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Tallgrass NatGas Operator, LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Terminals and NatGas | Tallgrass Energy Partners
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross					$ 140,000
DCP Assets Holding, LP | DCP Douglas
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Tallgrass Development LP | Rockies Express Pipeline LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				24.99%
Sempra U.S. Gas and Power | Rockies Express Pipeline LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								25.00%
Deeprock Development, LLC
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage						20.00%
Rockies Express Pipeline LLC
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage						49.99%
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity						$ (383,693)
Basis Difference, Amortization Period						35 years
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service						2.86%
Rockies Express Pipeline LLC | Tallgrass Energy Partners
Business Acquisition [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity				$ 386,800
Subsequent Event | Deeprock Development, LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	49.00%
Subsequent Event | Deeprock Development, LLC | Tallgrass Energy Partners
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 6,400	$ 57,300

Related Party Transactions - Sc

Related Party Transactions - Schedule of Transactions with Affiliated Companies (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Cost of transportation services	$ 4,907	$ 4,829	$ 9,414	$ 9,258
Operation and maintenance
Related Party Transaction [Line Items]
Expenses related to transactions with affiliated companies	7,430	6,373	13,707	12,557
General and administrative expense
Related Party Transaction [Line Items]
Expenses related to transactions with affiliated companies	11,095	10,206	20,668	19,643
Property, Plant and Equipment
Related Party Transaction [Line Items]
Property, plant and equipment, net	$ 510	$ 649	$ 803	$ 1,567

Related Party Transactions - 42

Related Party Transactions - Schedule of Balances with Affiliates Included in Accounts Receivables and Accounts Payable in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	$ 1,029	$ 590
Accounts payable to related parties	5,778	5,824
Rockies Express Pipeline LLC
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	1,029	590
Tallgrass Operations, LLC
Related Party Transaction [Line Items]
Accounts payable to related parties	5,778	5,811
Deeprock Development, LLC
Related Party Transaction [Line Items]
Accounts payable to related parties	$ 0	$ 13

Related Party Transactions - 43

Related Party Transactions - Schedule of Balances of Gas Imbalance with Affiliated Shippers (Detail) - Affiliated Shippers - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Affiliate gas imbalance receivables	$ 0	$ 177
Affiliate gas imbalance payables	$ 205	$ 0

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2017USD ($)
Public Company Expense | Tallgrass Development LP
Related Party Transaction [Line Items]
Public company cost reimbursement	$ 500,000

Inventory Inventory (Details)

Inventory Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Crude oil	$ 2,909	$ 5,462
Materials and supplies	6,366	6,383
Natural gas liquids	413	265
Gas in underground storage	1,553	983
Inventory, Net	$ 11,241	$ 13,093

Property Plant and Equipment -

Property Plant and Equipment - Components of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (235,539)	$ (195,860)
Property, plant and equipment	2,232,754	2,079,232
Crude oil pipelines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,218,337	1,202,125
Natural gas pipelines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	572,749	572,150
Gathering, processing and treating assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	401,186	256,901
General and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	253,508	223,310
Construction work in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 22,513	$ 20,606

Property, Plant and Equipment47

Property, Plant and Equipment (Details) - Gathering, processing and treating assets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 401,186	$ 256,901
DCP Douglas
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 138,200

Investments in Unconsolidated48

Investments in Unconsolidated Affiliates Equity Method Investments (Details) - Rockies Express Pipeline LLC - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	$ 207,149	$ 175,350	$ 408,487	$ 391,902
Equity Method Investment Summarized Financial Information Operating Income	112,703	85,352	220,072	201,411
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 70,945	$ 112,728	$ 137,195	$ 192,663

Investments in Unconsolidated49

Investments in Unconsolidated Affiliates Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated investments	$ 42,741	$ 24,022	$ 63,479	$ 24,731
Payments to Acquire Equity Method Investments			$ 17,835	$ 14,450
Rockies Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.99%		49.99%
Equity in earnings of unconsolidated investments			$ 62,107
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries			89,400
Payments to Acquire Equity Method Investments			$ 17,835
Rockies Express Pipeline LLC | Tallgrass Development LP
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					24.99%

Risk Management - Schedule of F

Risk Management - Schedule of Fair Value of Derivative Contracts (Detail) $ in Thousands	Jan. 01, 2016shares	Jun. 30, 2017USD ($)Bcfbbl	Dec. 31, 2016USD ($)Bcfbbl
Equity Option
Derivatives, Fair Value [Line Items]
Derivative asset at fair value			$ 10,676
Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		$ 207
Derivative liability at fair value			440
Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		13	291
Derivative liability at fair value			116
Other Current Assets | Equity Option
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		0	10,676
Other Current Assets | Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		207	0
Other Current Assets | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		13	291
Other Current Liabilities | Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative liability at fair value		0	440
Other Current Liabilities | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative liability at fair value		$ 0	$ 116
Commodity | Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount | bbl		30,000	125,000
Pony Express Pipeline
Derivatives, Fair Value [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	31.30%
Pony Express Pipeline | Equity Option
Derivatives, Fair Value [Line Items]
Derivative, Term of Contract	18 months
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	6,518,000
Long | Commodity | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount | Bcf		0.2	0.4
Short | Commodity | Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount | Bcf			0.3

Risk Management - Derivative Co

Risk Management - Derivative Contracts Included in Consolidated Statement of Income (Detail) - Derivatives not designated as hedging contracts - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Energy Related Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	$ 227	$ 148	$ 890	$ 148
Energy commodity derivative contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	(67)	(307)	106	(351)
Equity Option
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	$ 0	$ 18,953	$ 1,885	$ 10,007

Risk Management Risk Management

Risk Management Risk Management - Derivative Instruments Maximum Potential Exposure to Credit Loss (Details) - Energy commodity derivative contracts $ in Thousands	Jun. 30, 2017USD ($)
Concentration Risk [Line Items]
Gross	$ 220
Netting agreement impact	0
Cash collateral held	0
Net exposure	$ 220

Risk Management - Schedule of E

Risk Management - Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	$ 207
Derivative liability at fair value		$ 440
Energy Related Derivative | Quoted prices in active markets for identical assets (Level 1)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	0
Derivative liability at fair value		0
Energy Related Derivative | Significant other observable inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	207
Derivative liability at fair value		440
Energy Related Derivative | Significant unobservable inputs (Level 3)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	0
Derivative liability at fair value		0
Energy commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	13	291
Derivative liability at fair value		116
Energy commodity derivative contracts | Quoted prices in active markets for identical assets (Level 1)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	0	0
Derivative liability at fair value		0
Energy commodity derivative contracts | Significant other observable inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	13	291
Derivative liability at fair value		116
Energy commodity derivative contracts | Significant unobservable inputs (Level 3)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value	$ 0	0
Derivative liability at fair value		0
Equity Option
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		10,676
Equity Option | Quoted prices in active markets for identical assets (Level 1)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		0
Equity Option | Significant other observable inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		10,676
Equity Option | Significant unobservable inputs (Level 3)
Derivatives, Fair Value [Line Items]
Derivative asset at fair value		$ 0

Risk Management Risk Manageme54

Risk Management Risk Management - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 01, 2017	Oct. 31, 2016	Jul. 21, 2016	Jan. 01, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Partners' Capital Account, Units, Treasury Units Purchased	736,262
Partial exercise of call option	$ 35,300				$ 35,335	$ 0
Pony Express Pipeline
Derivative [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				31.30%
Equity Option
Derivative [Line Items]
Partners' Capital Account, Units, Treasury Units Purchased	1,703,094	1,251,760	3,563,146
Partial exercise of call option	$ 72,400	$ 53,200	$ 151,400		$ 72,381	$ 0
Equity Option | Pony Express Pipeline
Derivative [Line Items]
Derivative, Term of Contract				18 months
Option Indexed to Issuer's Equity, Strike Price				$ 42.50
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares				6,518,000

Long-term Debt Schedule of Debt

Long-term Debt Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt, net	$ 2,234,568	$ 1,555,981
Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term debt, net	1,495,000	1,163,000
Tallgrass Equity, LLC | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	147,000	148,000
Total long-term debt, net	147,000	148,000
Tallgrass Energy Partners
Debt Instrument [Line Items]
Less: Deferred financing costs, net	(10,432)	(7,019)
Tallgrass Energy Partners | Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000	400,000
Tallgrass Energy Partners | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	1,348,000	1,015,000
Total long-term debt, net	$ 1,348,000	$ 1,015,000

Long-term Debt Capacity under R

Long-term Debt Capacity under Revolving Credit Facility - Tallgrass Equity (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016	May 12, 2015
Line of Credit Facility [Line Items]
Long-term Debt	$ (2,234,568,000)	$ (1,555,981,000)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	(1,495,000,000)	(1,163,000,000)
Tallgrass Equity, LLC | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	150,000,000	150,000,000
Long-term Debt	(147,000,000)	(148,000,000)
Line of Credit Facility, Remaining Borrowing Capacity	3,000,000	2,000,000
Tallgrass Equity, LLC | Barclays Bank
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 150,000,000
Tallgrass Energy Partners | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,750,000,000	1,750,000,000
Long-term Debt	(1,348,000,000)	(1,015,000,000)
Letters of Credit Outstanding, Amount	(60,000)	0
Line of Credit Facility, Remaining Borrowing Capacity	$ 401,940,000	$ 735,000,000

Long-term Debt - Carrying Amoun

Long-term Debt - Carrying Amount and Fair Value of Long-term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt	$ 2,234,568	$ 1,555,981
Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Fair Value	763,695	398,000
Long-term Debt	739,568	392,981
Senior Notes | Quoted prices in active markets for identical assets (Level 1)
Debt Instrument [Line Items]
Long-term Debt, Fair Value	0	0
Senior Notes | Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Long-term Debt, Fair Value	763,695	398,000
Senior Notes | Significant unobservable inputs (Level 3)
Debt Instrument [Line Items]
Long-term Debt, Fair Value	0	0
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Fair Value	1,495,000	1,163,000
Long-term Debt	1,495,000	1,163,000
Revolving Credit Facility | Quoted prices in active markets for identical assets (Level 1)
Debt Instrument [Line Items]
Long-term Debt, Fair Value	0	0
Revolving Credit Facility | Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Long-term Debt, Fair Value	1,495,000	1,163,000
Revolving Credit Facility | Significant unobservable inputs (Level 3)
Debt Instrument [Line Items]
Long-term Debt, Fair Value	$ 0	$ 0

Long-term Debt - Additional Inf

Long-term Debt - Additional Information (Detail)	May 16, 2017USD ($)	Sep. 01, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 02, 2017USD ($)	Dec. 31, 2016USD ($)	May 12, 2015USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			$ 350,000,000	$ 0
Tallgrass Energy Partners
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			2.92%
Debt Instrument, Interest Rate, Effective Percentage			3.17%
Line of Credit Facility, Maximum Potential Accordion Feature					$ 250,000,000
Sublimit for Swing Line Loans					60,000,000
Sublimit for Letters of Credit					75,000,000
Tallgrass Energy Partners | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,750,000,000			$ 1,750,000,000
Tallgrass Energy Partners | Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,750,000,000
Tallgrass Energy Partners | Maximum | Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Consolidated leverage ratio			5
Credit facility commitment fee			0.50%
Contingent Consolidated Leverage Ratio			5.50
Consolidated Senior Secured Leverage Ratio One			3.75
Tallgrass Energy Partners | Minimum | Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Credit facility commitment fee			0.25%
Consolidated Interest Coverage Ratio One			2.50
Tallgrass Equity, LLC
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			3.73%
Debt Instrument, Interest Rate, Effective Percentage			3.74%
Tallgrass Equity, LLC | Barclays Bank
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 150,000,000
Tallgrass Equity, LLC | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 150,000,000			$ 150,000,000
Tallgrass Equity, LLC | Revolving Credit Facility | Barclays Bank
Debt Instrument [Line Items]
Credit facility commitment fee			0.50%
Tallgrass Equity, LLC | Maximum | Revolving Credit Facility | Barclays Bank
Debt Instrument [Line Items]
Consolidated leverage ratio			3
Senior Notes | Tallgrass Energy Partners
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 350,000,000	$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage			5.50%

Partnership Equity and Distri59

Partnership Equity and Distributions Partnership and Equity Distributions - TEGP Summary of Distributions (Details) - Tallgrass Energy GP, LP - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Distribution Made to Limited Partner [Line Items]
Partners' Capital Account, Distributions	$ 19,891	$ 16,697	$ 16,116	$ 12,528	$ 11,693	$ 10,022
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 0.3425	$ 0.2875	$ 0.2775	$ 0.2625	$ 0.2450	$ 0.2100

Partnership Equity and Distri60

Partnership Equity and Distributions Partnership Equity and Distributions - TEP Summary of Distributions (Details) - Tallgrass Energy Partners - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Distribution Made to Limited Partner [Line Items]
Limited Partner Common Units	$ 67,671	$ 60,486	$ 58,793	$ 57,332	$ 54,442	$ 48,238
Incentive Distribution Rights	36,342	29,840	28,358	26,987	24,262	19,816
General Partner Units	1,186	1,040	1,008	976	911	830
Partners' Capital Account, Distributions	$ 105,199	$ 91,366	$ 88,159	$ 85,295	$ 79,615	$ 68,884
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 0.9250	$ 0.8350	$ 0.8150	$ 0.7950	$ 0.7550	$ 0.7050

Partnership Equity and Distri61

Partnership Equity and Distributions - Additional Information (Detail) - USD ($)	Feb. 01, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	May 17, 2016	Jan. 01, 2016	May 13, 2015
Limited Partners' Capital Account [Line Items]
Partners' Capital Account, Units, Treasury Units Purchased	736,262
Payments for Repurchase of Common Stock	$ (35,300,000)							$ (35,335,000)	$ 0
Treasury Stock Acquired, Average Cost Per Share	$ 47.99
Partners' Capital Account, Authorized Amount										$ 657,500,000		$ 100,200,000
Partners' Capital Account, Units, Sold in Public Offering								2,341,061
SharesIssuedPricePerShareQTD								$ 48.82
Issuance of TEP units to public, net of offering costs								$ 112,800,000
LimitedPartnerOfferingCosts								1,500,000
Distributions to noncontrolling interests								$ 145,109,000	109,551,000
Pony Express Pipeline
Limited Partners' Capital Account [Line Items]
Equity interest held by noncontrolling interests		2.00%						2.00%
Distributions to noncontrolling interests								$ 0	425,882,000
Tallgrass Energy Partners
Limited Partners' Capital Account [Line Items]
Equity interest held by noncontrolling interests		72.61%						72.61%
Partners' Capital Account, Distributions		$ (105,199,000)	$ (91,366,000)	$ (88,159,000)	$ (85,295,000)	$ (79,615,000)	$ (68,884,000)
Tallgrass Equity, LLC
Limited Partners' Capital Account [Line Items]
Equity interest held by noncontrolling interests		63.06%						63.06%
Noncontrolling Interest
Limited Partners' Capital Account [Line Items]
Payments for Repurchase of Common Stock								$ 31,717,000
Contributions from noncontrolling interest								900,000	7,300,000
Distributions to noncontrolling interests								(145,100,000)	109,600,000
Tallgrass Equity distributions to noncontrolling interests								56,000,000	41,900,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders								2,800,000	3,300,000
Contributions from TD								1,451,000
Noncontrolling Interest | Tallgrass Energy Partners
Limited Partners' Capital Account [Line Items]
Issuance of TEP units to public, net of offering costs								101,375,000	239,611,000
Partners' Capital Account, Distributions								86,300,000	64,300,000
Total Partner Equity Including Portion Attributable to Noncontrolling Interest
Limited Partners' Capital Account [Line Items]
Payments for Repurchase of Common Stock								35,335,000
Contributions from noncontrolling interest								867,000	7,273,000
Distributions to noncontrolling interests								145,109,000	109,551,000
Contributions from TD								2,301,000
Total Partner Equity Including Portion Attributable to Noncontrolling Interest | Tallgrass Energy Partners
Limited Partners' Capital Account [Line Items]
Issuance of TEP units to public, net of offering costs								$ 112,762,000	$ 261,770,000
Pony Express Pipeline
Limited Partners' Capital Account [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired											31.30%

Net Income per Class A Share 62

Net Income per Class A Share Net Income per Class A Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to TEGP, excluding predecessor operations interest	$ 8,753	$ 3,448	$ 20,782	$ 11,037
Basic average number of Class A shares outstanding	58,075	47,725	58,075	47,725
Basic net income per Class A share	$ 0.15	$ 0.07	$ 0.36	$ 0.23
Incremental net income attributable to TEGP including the effect of the assumed issuance of Equity Participation Shares	$ 38	$ 1	$ 64	$ 0
Net income attributable to TEGP including incremental net income from assumed issuance of Equity Participation Shares	$ 8,791	$ 3,449	$ 20,846	$ 11,037
Equity Participation Shares equivalent shares	117	9	112	0
Diluted weighted average Class A Shares outstanding	58,192	47,734	58,187	47,725
Diluted net income per Class A Share	$ 0.15	$ 0.07	$ 0.36	$ 0.23

Regulatory Matters Regulatory M

Regulatory Matters Regulatory Matters (Details) - MMBTU / d MMBTU / d in Thousands	Jan. 06, 2017	Jul. 01, 2017
Public Utilities, General Disclosures [Line Items]
Capacity Enhancement	0
Pony Express Pipeline
Public Utilities, General Disclosures [Line Items]
FERC Annual Index Adjustment		0.20%

Legal and Environmental Matte64

Legal and Environmental Matters - Additional Information (Detail)

Jul. 12, 2017USD ($)

Feb. 16, 2017USD ($)

Feb. 02, 2017USD ($)

Jan. 12, 2017USD ($)Bcf / d

Jun. 17, 2014USD ($)

Jan. 31, 2017bbl

Jun. 30, 2017USD ($)ft-lb

Dec. 31, 2017USD ($)

Dec. 31, 2016USD ($)Bcf / dmi

Dec. 31, 2015USD ($)mi

Mar. 31, 2017USD ($)

Dec. 31, 2016USD ($)

Apr. 14, 2016USD ($)

Loss Contingencies [Line Items]

Environmental accruals

$ 7,200,000

$ 4,000,000

$ 4,000,000

Aggregate cost of crack tool runs

$ 9,800,000

Crude Oil Spilled or Leaked | bbl

10,000

Crude oil recovered | bbl

9,000

Total Remediation costs

$ 600,000

General Partner

Loss Contingencies [Line Items]

Contributions from TD

$ 20,000,000

Subsequent Event

Loss Contingencies [Line Items]

Aggregate cost of crack tool runs

$ 9,000,000

Trailblazer

Loss Contingencies [Line Items]

Miles of Natural Gas Pipeline Needing Repair or Replacement | mi

8

Maximum Allowable Operating Pressure | ft-lb

144,000

Excavation Digs

32

Aggregate Cost of Excavation Digs

$ 1,300,000

Estimated pipeline replacement costs

$ 19,000,000

Trailblazer | Subsequent Event

Loss Contingencies [Line Items]

Estimated remediation and cleanup costs

$ 2,500,000

Trailblazer | Minimum

Loss Contingencies [Line Items]

Miles of Natural Gas Pipeline Needing Repair or Replacement | mi

25

Trailblazer | Maximum

Loss Contingencies [Line Items]

Miles of Natural Gas Pipeline Needing Repair or Replacement | mi

35

Pipeline replacement costs

$ 2,700,000

Tallgrass Development LP

Loss Contingencies [Line Items]

Contractual indemnity provided to TEP by TD

20,000,000

Annual deductible

$ 1,500,000

Ultra Resources Complaint

Loss Contingencies [Line Items]

Firm transportation service agreement | Bcf / d

0.2

0.2

Gain Contingency, Unrecorded Amount

$ 303,000,000

Firm Transportation Rate

$ 0.37

Anticipated Annual Revenue

$ 26,800,000

Ultra Resources Complaint | Subsequent Event

Loss Contingencies [Line Items]

Litigation Settlement, Amount

$ 150,000,000

Michels Corporation Complaint

Loss Contingencies [Line Items]

Litigation Settlement, Amount

$ 10,000,000

$ 10,000,000

Loss Contingency, Damages Sought, Value

$ 24,200,000

Withholding for Liquidated Delay Damages and Excess Completion Costs

$ 5,900,000

Reporting Segments - Summary of

Reporting Segments - Summary of TEGP's Segment Information of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total Revenues	$ 160,863	$ 149,015	$ 305,263	$ 296,183
TEGP
Segment Reporting Information [Line Items]
Total Revenues	160,863	149,015	305,263	296,183
TEGP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Total Revenues	96,052	93,562	181,144	188,216
TEGP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Total Revenues	31,668	30,732	66,651	62,045
TEGP | Processing & Logistics
Segment Reporting Information [Line Items]
Total Revenues	33,143	24,721	57,468	45,922
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
TEGP | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	162,305	150,425	308,150	298,948
TEGP | Operating Segments | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Total Revenues	96,052	93,562	181,144	188,216
TEGP | Operating Segments | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Total Revenues	33,110	32,142	69,538	64,810
TEGP | Operating Segments | Processing & Logistics
Segment Reporting Information [Line Items]
Total Revenues	33,143	24,721	57,468	45,922
TEGP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
TEGP | Inter-Segment
Segment Reporting Information [Line Items]
Total Revenues	(1,442)	(1,410)	(2,887)	(2,765)
TEGP | Inter-Segment | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
TEGP | Inter-Segment | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Total Revenues	(1,442)	(1,410)	(2,887)	(2,765)
TEGP | Inter-Segment | Processing & Logistics
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
TEGP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	$ 0	$ 0	$ 0	$ 0

Reporting Segments - Summary 66

Reporting Segments - Summary of TEGP's Segment Information of Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Operating Income	$ 66,944	$ 54,758	$ 130,170	$ 118,203
Reconciliation to Net Income:
Interest expense, net	21,114	10,441	37,131	19,118
Unrealized gain on derivative instrument	0	18,953	1,885	10,007
Equity in earnings of unconsolidated investments	42,741	24,022	63,479	24,731
Other income, net	272	221	342	787
Net income before tax	88,843	87,513	158,745	134,610
TEGP
Segment Reporting Information [Line Items]
Operating Income	66,944	54,758	130,170	118,203
Reconciliation to Net Income:
Net income before tax	88,843	87,513	158,745	134,610
TEGP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Operating Income	53,119	48,491	99,178	103,797
TEGP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Operating Income	13,284	10,682	30,007	21,672
TEGP | Processing & Logistics
Segment Reporting Information [Line Items]
Operating Income	5,359	(1,308)	9,576	(1,120)
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Operating Income	(4,818)	(3,107)	(8,591)	(6,146)
TEGP | Operating Segments
Segment Reporting Information [Line Items]
Operating Income	66,944	54,758	130,170	118,203
TEGP | Operating Segments | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Operating Income	51,774	47,145	96,489	101,106
TEGP | Operating Segments | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Operating Income	14,726	12,092	32,894	24,437
TEGP | Operating Segments | Processing & Logistics
Segment Reporting Information [Line Items]
Operating Income	5,262	(1,372)	9,378	(1,194)
TEGP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Operating Income	(4,818)	(3,107)	(8,591)	(6,146)
TEGP | Inter-Segment
Segment Reporting Information [Line Items]
Operating Income	0	0	0	0
TEGP | Inter-Segment | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Operating Income	1,345	1,346	2,689	2,691
TEGP | Inter-Segment | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Operating Income	(1,442)	(1,410)	(2,887)	(2,765)
TEGP | Inter-Segment | Processing & Logistics
Segment Reporting Information [Line Items]
Operating Income	97	64	198	74
TEGP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Operating Income	0	0	0	0
TEGP | Segment Reconciling Items
Reconciliation to Net Income:
Interest expense, net	21,114	10,441	37,131	19,118
Unrealized gain on derivative instrument	0	18,953	1,885	10,007
Equity in earnings of unconsolidated investments	42,741	24,022	63,479	24,731
Other income, net	$ 272	$ 221	$ 342	$ 787

Reporting Segments Reporting Se

Reporting Segments Reporting Segments - Summary of TEP's Segment Information for Payments to Acquire Plant, Property and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Capital expenditures	$ 53,995	$ 34,860
TEGP
Segment Reporting Information [Line Items]
Capital expenditures	53,995	34,860
TEGP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	22,340	25,529
TEGP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	8,368	4,115
TEGP | Processing & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	23,287	5,216
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Capital expenditures	$ 0	$ 0

Reporting Segments - Summary 68

Reporting Segments - Summary of TEGP's Segment Information of Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Segment assets	$ 4,219,188	$ 3,625,480
TEGP
Segment Reporting Information [Line Items]
Segment assets	4,219,188	3,625,480
TEGP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Segment assets	1,483,361	1,493,866
TEGP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Segment assets	1,624,714	1,176,147
TEGP | Processing & Logistics
Segment Reporting Information [Line Items]
Segment assets	583,963	411,999
TEGP | Corporate and Other
Segment Reporting Information [Line Items]
Segment assets	$ 527,150	$ 543,468

Reporting Segments - Additional

Reporting Segments - Additional Information (Detail) - Segment	6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jan. 01, 2017
Segment Reporting Information [Line Items]
Number of reportable segments	3
Tallgrass Terminals, LLC
Segment Reporting Information [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Tallgrass NatGas Operator, LLC
Segment Reporting Information [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Rockies Express Pipeline LLC | Tallgrass Development LP
Segment Reporting Information [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		24.99%
Rockies Express Pipeline LLC
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	49.99%

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	Aug. 02, 2017	Jul. 21, 2017	Jul. 20, 2017	Jul. 12, 2017	Jun. 30, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross					$ 140,000	$ 0
Deeprock Development, LLC | Subsequent Event
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		49.00%
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	69.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		128,790
Common Unit, Issuance Value		$ 6,700
Kinder Morgan Cushing, LLC | Deeprock Development, LLC | Subsequent Event
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			40.00%
Deeprock Energy Resources, LLC | Deeprock Development, LLC | Subsequent Event
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		9.00%
Tallgrass Energy Partners
Subsequent Event [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest					27.08%
Tallgrass Energy Partners | Deeprock Development, LLC | Subsequent Event
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross		$ 6,400	$ 57,300
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination		$ 13,100
Ultra Resources Complaint | Subsequent Event
Subsequent Event [Line Items]
Litigation Settlement, Amount				$ 150,000