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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net income | $ 36,094 | $ 28,903 | $ 32,687
Other comprehensive income (loss): |  |  |
Foreign currency translation adjustment | 479 | 4,445 | (2,788)
Unrealized gains on derivative instruments | 0 | 0 | 144
Net gain (loss) on pension and other postretirement benefits | 6,706 | (574) | (6,533)
Other comprehensive income (loss) before income tax expense (benefit) | 7,185 | 3,871 | (9,177)
Income tax expense (benefit) related to items of other comprehensive income (loss) | (2,516) | 121 | 2,021
Other comprehensive income (loss) | 4,669 | 3,992 | (7,156)
Comprehensive income | $ 40,763 | $ 32,895 | $ 25,531

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