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OTHER COMPREHENSIVE (LOSS) INCOME | 12 Months Ended
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Dec. 31, 2012
OTHER COMPREHENSIVE (LOSS) INCOME | 3. OTHER COMPREHENSIVE (LOSS) INCOME Other comprehensive (loss) income consists of the currency translation adjustment associated with the use of local currency by our Canadian operations as its functional currency, changes in the unrealized gain on available-for-sale securities and the effective portion of a cash flow hedge that matured in October 2011. The tax effects allocated to each component of other comprehensive (loss) income are as follows:
Years Ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
Foreign currency translation adjustment |  | $ | (1,785 | ) |  | $ | — |  |  | $ | — |
Unrealized gain on derivative instrument |  |  | — |  |  |  | 384 |  |  |  | 311 |
Income tax expense |  |  | — |  |  |  | (146 | ) |  |  | (117 | )
Unrealized gain on derivative instrument, net of tax |  |  | — |  |  |  | 238 |  |  |  | 194 |
Unrealized gain on available-for-sale securities |  |  | 63 |  |  |  | 6 |  |  |  | 53 |
Income tax expense |  |  | (28 | ) |  |  | (3 | ) |  |  | (19 | )
Unrealized gain on available-for-sale securities, net of tax |  |  | 35 |  |  |  | 3 |  |  |  | 34 |
Other comprehensive (loss) income |  | $ | (1,750 | ) |  | $ | 241 |  |  | $ | 228 |
The changes in accumulated other comprehensive loss, net of tax, are as follows:
Years Ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
Foreign currency translation adjustment: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | — |  |  | $ | — |
Current period other comprehensive loss |  |  | (1,785 | ) |  |  | — |  |  |  | — |
Ending balance |  |  | (1,785 | ) |  |  | — |  |  |  | — |
Derivative instrument: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | — |  |  |  | (238 | ) |  |  | (432 | )
Current period other comprehensive income |  |  | — |  |  |  | 238 |  |  |  | 194 |
Ending balance |  |  | — |  |  |  | — |  |  |  | (238 | )
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | (352 | ) |  |  | (355 | ) |  |  | (389 | )
Current period other comprehensive income |  |  | 35 |  |  |  | 3 |  |  |  | 34 |
Ending balance |  |  | (317 | ) |  |  | (352 | ) |  |  | (355 | )
Accumulated other comprehensive loss, net of tax |  | $ | (2,102 | ) |  | $ | (352 | ) |  | $ | (593 | )

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14-26 -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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e709-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e716-108580 + Details
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