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Other Noncurrent Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract] |
Other Noncurrent Liabilities | Other noncurrent liabilities consist of the following at December 31, 2017 and 2016 (in thousands):
| December 31,
| 2017 |  | 2016
Transition tax on foreign earnings(a) | $ | 394,878 |  |  | $ | — |
Liabilities related to uncertain tax positions(b) | 24,369 |  |  | 27,919 |
Executive deferred compensation plan obligation | 25,494 |  |  | 22,037 |
Environmental liabilities(c) | 37,518 |  |  | 32,595 |
Asset retirement obligations(c) | 40,450 |  |  | 36,296 |
Tax indemnification liability(d) | 42,707 |  |  | 38,255 |
Other(e) | 33,758 |  |  | 37,708 |
Total(f) | $ | 599,174 |  |  | $ | 194,810 |
(a) | Noncurrent portion of one-time transition tax on foreign earnings. See Note 20, “Income Taxes,” for additional information.
(b) | See Note 20, “Income Taxes.”
(c) | See Note 17, “Commitments and Contingencies.”
(d) | Indemnification of certain income and non-income tax liabilities associated with the Chemetall Surface Treatment entities sold.
(e) | No individual component exceeds 5% of total liabilities.
(f) | As of December 31, 2017, $0.6 million of Other noncurrent liabilities were classified as Liabilities held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

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