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Common Stock and Class B Common Stock Preferred Share Purchase Rights (Details)
Sep. 25, 2016
USD ($)
$ / shares
Class of Warrant or Right [Line Items]  
Preferred Share Purchase Rights- Exercise Price | $ $ 150
Preferred Stock, Redemption Price Per Share | $ / shares $ 0.001
2008 And After [Member]  
Class of Warrant or Right [Line Items]  
Beneficial OwnershipThreshold 25.00%
Beneficial Ownership Threshold 15.00%
Beneficial Ownership Percentage- Upper Limit 50.00%
Prior To 2008 [Member]  
Class of Warrant or Right [Line Items]  
Beneficial OwnershipThreshold 20.00%