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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Currency translation adjustment, income tax expense	$ 0	$ 111	$ 210
Change in unrecognized net periodic pension costs, income tax benefit	2,361	(2,429)	1,671
Other, income tax benefits	$ 72omi_Othercomprehensiveincomeothertax	$ 32omi_Othercomprehensiveincomeothertax	$ 32omi_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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