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Investments Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Investments [Line Items] |  |  |  |
Equity in net income of unconsolidated investments (net of tax) |  | $ 30,999 | $ 35,742 | $ 31,729
Dividends received from unconsolidated investments |  | 59,912 | 40,688 | 21,632
Investments in unconsolidated joint ventures exceeded the amount of underlying equity in net assets |  | 11,500 | 7,000 |
Excess amount paid for joint ventures remaining to be amortized |  | 800 | 1,000 |
Return of capital from unconsolidated investment |  | 98,000 | 0 | 0
Marketable equity securities |  | 24,257 | 23,974 |
Long-term advances to joint ventures | [1] | 31,780 | 34,084 |
Significant Unconsolidated Joint Venture |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment in significant unconsolidated joint ventures |  | 402,600 | 148,300 |
Equity in net income of unconsolidated investments (net of tax) |  | 25,400 | 34,700 | 32,200
Undistributed earnings from equity method investees |  | 105,900 | 107,800 |
Dividends received from unconsolidated investments |  | $ 58,100 | $ 39,600 | $ 20,100
Windfield Holdings |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Ownership percentage |  | 49.00% | 0.00% | 0.00%
Return of capital from unconsolidated investment |  | $ 98,000 |  |
Saudi Organometallic Chemicals Company |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Ownership percentage |  | 50.00% |  |
Interest rate margin over LIBOR |  | 1.275% |  |
Benefit Protection Trust |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Marketable equity securities |  | $ 21,600 | $ 22,200 |
Other Assets | Saudi Organometallic Chemicals Company |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term advances to joint ventures |  | $ 30,000 | 30,000 |
Windfield Holdings |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Ownership percentage |  | 49.00% |  |
Carrying value of unconsolidated investment |  | $ 280,200 |  |
Other Variable Interest Entities Excluding Windfield Holdings |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Carrying value of unconsolidated investment |  | 27,600 | $ 6,200 |
Rockwood Holdings, Inc. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Utilization of inventory markup |  | 103,000 |  |
Equity in Net Income of Unconsolidated Investments | Rockwood Holdings, Inc. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Utilization of inventory markup |  | $ 27,100 |  |
[1] | See Note 10, “Investments.”

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