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Other Non-Operating Income (Expense), Net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other non-operating income [Abstract]      
Interest and dividend income $ 167 $ 28 $ 296
Equity income from joint ventures 0 351 97
Gain on the sale of joint ventures 0 2,475 0
Gain (loss) on foreign exchange (380) 416 (60)
Other income (expense), net (483) 100 92
Total other non-operating income, net $ (696) $ 3,370 $ 425