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Components of Accumulated other comprehensive loss (Tables) | 6 Months Ended
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Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of Accumulated Other Comprehensive Loss |
| June 30, 2013 | December 31, 2012
Defined benefit plan liabilities | $ | (140,338 | ) | $ | (153,225 | )
Equity in investee other comprehensive income (1) | (12,712 | ) | (12,712 | )
Unrealized loss on financial instruments | (971 | ) | (878 | )
Other comprehensive loss before income tax effect | (154,021 | ) | (166,815 | )
Income tax effect (2) | 14,858 |  | 15,623 |
Accumulated other comprehensive loss | $ | (139,163 | ) | $ | (151,192 | )
(1) | The amount includes our equity in the other comprehensive income of Mt. Holly Aluminum Company.
(2)The allocation of the income tax effect to the components of other comprehensive income is as follows:
| June 30, 2013 | December 31, 2012
Defined benefit plan liabilities | $ | 15,037 |  | $ | 15,784 |
Equity in investee other comprehensive income | 453 |  | 488 |
Unrealized loss on financial instruments | (632 | ) | (649 | )

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- Definition Tabular disclosure of components of comprehensive income (loss) including, but not limited to: (a) foreign currency translation adjustments; (b) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (c) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (d) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (e) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (f) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (g) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e526-108580 + Details
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