Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts receivable non-trade	$ 19,868	$ 13,032
Accumulated depreciation	$ 1,476,563	$ 1,494,038
Convertible Preferred Stock
Convertible Preferred Units, issued	0	12,500,000.0
Convertible Preferred Units, outstanding	0	12,500,000.0
Common Units
Limited partners - units issued	410,000,000	147,500,000
Limited partners - units outstanding	410,000,000	147,500,000
Preferred Units
Limited partners - units issued	11,000,000	11,000,000
Limited partners - units outstanding	11,000,000	11,000,000

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The number of limited partner units issued.

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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