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Fair Value Measurements (Securities in Unrealized Loss Positions) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses $ (4,070)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 534,152
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (253)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 33,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (4,323)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 567,974
Corporate Bond Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (1,258)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 32,400
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (1,258)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 32,400
US Government Agencies Debt Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (25)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 99,975
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (25)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 99,975
Agency Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (2,787)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 401,777
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (253)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 33,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (3,040)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 435,599