Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable, non-trade	$ 32,387	$ 13,032
Accumulated depreciation	$ 1,562,172	$ 1,494,038
Convertible Preferred Units
Convertible Preferred Units, units issued	0	12,500,000
Convertible Preferred Units, units outstanding	0	12,500,000
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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