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Acquisition (Narrative) (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Sep. 01, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Cash payment to acquire business |  | $ 0 | $ 759 |
Class A Convertible Preferred Stock Units | Private Placement |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Temporary equity, stock issued during period (in shares) | $ 750,000 |  |  |
6.500% Senior Unsecured Notes Due October 2025 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt issued |  | $ 550,000 |  | $ 550,000
Senior unsecured notes, stated rate |  | 6.50% |  | 6.50%
Alkali Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash payment to acquire business | 1,325,000 |  |  |
Working capital included in cash payment to acquire business | 105,000 |  |  |
Alkali Business | Class A Convertible Preferred Stock Units | Private Placement |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Temporary equity, stock issued during period (in shares) | 750,000 |  |  |
Proceeds from issuance of Class A convertible preferred units, net | 726,200 |  |  |
Alkali Business | 6.500% Senior Unsecured Notes Due October 2025 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt issued | $ 550,000 |  |  |
Senior unsecured notes, stated rate | 6.50% |  |  |
Proceeds from issuance of unsecured debt | $ 540,100 |  |  |

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