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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Currency translation adjustments, income tax expense	$ 0	$ 0
Change in unrecognized net periodic pension costs, income tax benefit	143	97
Other, income tax expense	$ 0omi_OtherComprehensiveIncomeOtherTax	$ 8omi_OtherComprehensiveIncomeOtherTax

Tax effect of current period adjustment resulting from gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, that is, settlement is not planned or anticipated in the foreseeable future. Applies when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting entity's financial statements. Reported in equity as part of accumulated other comprehensive income.

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