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Exit of Joint Venture (Details) (USD $)
9 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Audco [Member]
Mar. 28, 2013
Audco [Member]
Schedule of Equity Method Investments [Line Items]        
Percentage acquired       100.00%
Percentage ownership sold       50.00%
Proceeds from sale of equity method investment     $ 46,200,000  
Cash payment for acquisition of equity method investment 10,143,000 3,996,000 10,100,000  
Assets       25,000,000
Remeasurement gain     15,300,000  
Gain on sale of equity method investment affiliate     $ 13,000,000  
Ownership percentage       50.00%