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Investments Continuous Unrealized Loss (Details) (Marketable equity securities [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Marketable equity securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Less than twelve months, Unrealized Losses $ (1,270)
Available-for-sale Securities, Less than twelve months, Fair Value 3,861
Available-for-sale Securities, Twelve months or more, Unrealized Losses (11,802)
Available-for-sale Securities, Twelve months or more, Fair Value 10,874
Available-for-sale Securities, Total, Unrealized Losses (13,072)
Available-for-sale Securities, Total, Fair Value $ 14,735