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Debt (Senior Unsecured Notes) (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 11, 2017 | Sep. 01, 2017 | Aug. 14, 2017 | Jul. 23, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 31, 2015 | May 21, 2015 | May 15, 2014 | Feb. 08, 2013 | Feb. 01, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 6,242,000 | $ 0 | $ 19,225,000 |  |  |  |  |
Proceeds from issuance of unsecured debt |  |  |  |  | 1,000,000,000 | 0 | 1,139,718,000 |  |  |  |  |
Enterprise Offshore Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
5.750% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  | 145,170,000 | 350,000,000 |  |  |  |  | $ 350,000,000 |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  |  | 5.75% |
Proceeds used to repay unsecured debt principal | $ 204,800,000 |  |  |  |  |  |  |  |  |  |  |
6.250% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal | $ 450,000,000 |  |  |  | 450,000,000 | 0 |  |  |  |  |  |
Debt instrument, stated rate | 6.25% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount | $ 442,000,000 |  |  |  |  |  |  |  |  |  |  |
5.625% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  | 350,000,000 | 350,000,000 |  |  |  | $ 350,000,000 |  |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  | 5.625% |  |
6.000% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  | 400,000,000 | 400,000,000 |  |  | $ 400,000,000 |  |  | $ 350,000,000
Debt instrument, stated rate |  |  |  |  |  |  |  |  | 6.00% |  |  |
7.875% Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  |  |  |  |  | 7.875%
Note tender offer |  |  |  |  |  |  | 300,100,000 |  |  |  |  |
Redemption premium |  |  |  |  |  |  | 49,900,000 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 19,200,000 |  |  |  |  |
6.750% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  | $ 750,000,000 | 750,000,000 | 750,000,000 |  |  |  |  |  |
6.750% senior unsecured notes | Enterprise Offshore Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  | 6.75% |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  |  |  | $ 728,600,000 |  |  |  |  |  |  |  |
6.500% senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  |  |  |  | $ 550,000,000 | $ 0 |  |  |  |  |  |
6.500% senior unsecured notes | Alkali Business [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, principal |  | $ 550,000,000 | $ 550,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  | 6.50% | 6.50% |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discount |  | $ 540,100,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  |  | $ 540,100,000 |  |  |  |  |  |  |  |  |

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