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Commitments and Contingencies - Gain Contingencies (Details) (USD $)
 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Other Litigation
Feb. 28, 2012
Misappropriation of Trade Secrets [Member]
Biamp
Jan. 31, 2007
Misappropriation of Trade Secrets [Member]
Biamp
principals
Feb. 28, 2012
Misappropriation of Trade Secrets [Member]
Other Defendents
Dec. 31, 2013
Misappropriation of Trade Secrets [Member]
Other Defendents
Oct. 31, 2008
Illiquid Securities
UBS and Morgan Stanley
Dec. 31, 2008
Illiquid Securities
UBS and Morgan Stanley
Dec. 31, 2012
Illiquid Securities
UBS
Gain Contingencies                
Gain contingency, number of defendents     2          
Gain contingency, unrecorded amount         $ 7,658,000      
Gain (loss) related to litigation settlement   3,860,000   250,000       45,000,000
Auction rate securities, noncurrent             12,200,000  
Auction rate securities, repurchase offer, amount           12,200,000    
Litigation settlement, contingency legal fee, percentage               15.00%
Litigation settlement, contingency legal fee, amount               6,750,000
Loss contingency, estimate of possible loss $ 1,000,000