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Acquisition and Divestiture (Narrative) (Details) - USD ($) $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Aug. 14, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Cash payment to acquire business |  | $ 1,325,759 | $ 25,394 |  |
Proceeds from issuance of Series A convertible preferred units, net |  | 729,958 | $ 0 |  |
6.500% Senior Unsecured Notes Due October 2025 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt issued |  | $ 550,000 |  |  | $ 0
Senior unsecured notes, stated rate |  | 6.50% |  |  | 6.50%
Class A Convertible Preferred Stock Units | Private Placement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from issuance of convertible preferred stock, gross | $ 750,000 |  |  |  |
Alkali Business |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Transaction Costs |  | $ 10,400 |  |  |
Cash payment to acquire business | 1,325,000 |  |  |  |
Working capital included in cash payment to acquire business | $ 100,000 |  |  |  |
Average useful life of fixed assets acquired | 15 years |  |  |  |
Alkali Business | 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% |
Proceeds from issuance of unsecured debt | $ 540,100 |  |  |  |
Alkali Business | Class A Convertible Preferred Stock Units | Private Placement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from issuance of convertible preferred stock, gross | 750,000 |  |  |  |
Proceeds from issuance of Series A convertible preferred units, net | $ 726,200 |  |  |  |

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