Equity-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation expense
Number of stock-based compensation awards authorized	16,906,500
Number of shares available for future grant under the Plan	8,351,638
Equity based compensation expense recognized	$ 70,414	$ 103,445	$ 102,421
Midstream Plan
Stock-based compensation expense
Number of stock-based compensation awards authorized	10,000,000
Number of shares available for future grant under the Plan	7,932,261
Restricted stock awards
Stock-based compensation expense
Equity based compensation expense recognized	$ 41,505	70,866	73,081
Performance share unit awards
Stock-based compensation expense
Equity based compensation expense recognized	9,659	10,797	8,685
Stock options
Stock-based compensation expense
Equity based compensation expense recognized	1,799	2,375	2,578
Antero Midstream Partners Phantom Unit Awards
Stock-based compensation expense
Equity based compensation expense recognized	15,351	17,461	16,095
Equity awards issued to directors
Stock-based compensation expense
Equity based compensation expense recognized	$ 2,100	$ 1,946	$ 1,982

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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