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Segment Information Equity Method Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity Method Investments [Abstract]      
Equity method investments $ 1,231us-gaap_EquityMethodInvestments $ 1,690us-gaap_EquityMethodInvestments $ 495us-gaap_EquityMethodInvestments