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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus 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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Partners' Capital, Mezzanine Capital and Distributions (Redeemable Noncontrolling Interest - Narrative) (Details) - USD ($)			3 Months Ended		6 Months Ended
	Apr. 14, 2020	Sep. 23, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest redemption value adjustments			$ 5,766,000	$ 4,159,000	$ 10,557,000	$ 8,245,000
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions					8,955,000
Redemption accretion fair value adjustment					$ 1,602,000
Redeemable Noncontrolling Interest Preferred Units
Redeemable Noncontrolling Interest [Line Items]
Number of preferred units outstanding (in units)			201,705		201,705		141,249
Subsidiary \| Alkali Holdings
Redeemable Noncontrolling Interest [Line Items]
Issuance of redeemable noncontrolling interest		$ 55,000,000
Facility expansion costs percentage		100.00%
Expansion project extension period	1 year
Equity preferred units issued (in units)	1,750				54,100
Commitment period	4 years
Period for occurrence of triggering events		6 years 6 months
Redeemable noncontrolling interest redemption value adjustments			$ 5,800,000	4,200,000	$ 10,600,000	8,200,000
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions			4,900,000	3,400,000	9,000,000.0	6,700,000
Redemption accretion fair value adjustment			900,000	$ 800,000	1,600,000	$ 1,500,000
Redemption value of redeemable preferred noncontrolling interest			$ 248,900,000		$ 248,900,000
Subsidiary \| Alkali Holdings \| Redeemable Noncontrolling Interest Preferred Units
Redeemable Noncontrolling Interest [Line Items]
Number of preferred units outstanding (in units)		55,000	201,705		201,705
Subsidiary \| Alkali Holdings \| Maximum
Redeemable Noncontrolling Interest [Line Items]
Number of preferred units outstanding (in units)	351,750
Redeemable noncontrolling interest preferred commitment	$ 351,750,000	$ 350,000,000