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Consoldiated Statements of Comprehensive Income (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net income (loss) | $ (754,000) | $ 213,026,000 | $ 240,659,000
Net unrealized gain (loss) on derivative instruments arising during the period, net of tax of $4,829, $4,683 and $(1,867) in 2012, 2011 and 2010, respectively | 8,497,000 | 7,900,000 | (3,077,000)
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income, net of tax of $5,141, $0 and $(2,305) in 2012, 2011 and 2010, respectively | 8,754,000 | 0 | (3,750,000)
Net unrealized gain (loss) on derivative instruments qualifying as hedges | (257,000) | 7,900,000 | 673,000
Postretirement liability losses arising during the period, net of tax of $(2,060), $(14,205) and $(4,112) in 2012, 2011 and 2010, respectively | (3,106,000) | (23,473,000) | (6,528,000)
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax of $1,379, $632 and $503 in 2012, 2011 and 2010, respectively | 2,079,000 | 1,046,000 | 798,000
Postretirement liability adjustment | (1,027,000) | (22,427,000) | (5,730,000)
Foreign currency translation adjustment, net of tax of $(294), $(832) and $(3,486) in 2012, 2011 and 2010, respectively | (473,000) | (1,295,000) | (5,371,000)
Net unrealized gains on available-for-sale investments, net of tax of $20 and $44 in 2012 and 2011, respectively | 37,000 | 82,000 | 0
Other comprehensive loss | (1,720,000) | (15,740,000) | (10,428,000)
Comprehensive income (loss) | (2,474,000) | 197,286,000 | 230,231,000
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract] |  |  |
Net unrealized gain (loss) on derivative instruments arising during the period, tax | 4,829,000 | 4,683,000 | (1,867,000)
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income, tax | 5,141,000 | 0 | (2,305,000)
Postretirement liability losses arising during the period, tax | (2,060,000) | (14,205,000) | (4,112,000)
Amortization of postretirement liability losses included in net periodic benefit cost, tax | 1,379,000 | 632,000 | 503,000
Foreign currency translation adjustment, tax | (294,000) | (832,000) | (3,486,000)
Net unrealized gains on available-for-sale investments, tax | $ 20,000 | $ 44,000 | $ 0

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- Definition Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580 + Details
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