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Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Sep. 01, 2017 | Jul. 24, 2015
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Alkali Business [Member] |  |
Business Acquisition [Line Items] |  |
Accounts receivable | $ 138,258 |
Inventories | 34,929 |
Other current assets | 13,254 |
Fixed assets | 663,217 |
Mineral leaseholds | 566,019 |
Intangible assets | 800 |
Other assets | 3,612 |
Accounts payable | (44,547) |
Accrued liabilities | (36,884) |
Other long-term liabilities | (13,658) |
Total purchase price | $ 1,325,000 |
Enterprise Offshore Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Cash |  | $ 1,270
Accounts receivable |  | 29,768
Inventories |  | 600
Other current assets |  | 10,432
Fixed assets |  | 1,225,685
Intangible assets |  | 79,050
Equity investees |  | 352,535
Other assets |  | 1,966
Accounts payable |  | (6,110)
Accrued liabilities |  | (18,662)
Other long-term liabilities |  | (161,412)
Noncontrolling interest |  | 6,447
Total purchase price |  | $ 1,521,569

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