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Investments in Unconsolidated Entities (Details 2) (High Power Optoelectronics, USD $)
In Millions, unless otherwise specified
1 Months Ended
Oct. 31, 2012
Cost Method Investments  
Percentage of cost method investee owned 9.90%
Investment of equity interest $ 2.9
Period within which the entity can exercise option to increase equity interest 1 year
Minimum
 
Cost Method Investments  
Option to increase equity interest (as a percent) 50.00%