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Fair Value Measurements (Securities in Unrealized Loss Positions) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ (1,187)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 485,129
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | (85)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 72,550
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | (1,272)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 557,679
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 | (292)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 37,802
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 9,994
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | (298)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 47,796
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 | (51)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 17,582
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 | (51)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 17,582
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 | (844)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 429,745
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | (79)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 62,556
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | (923)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 492,301

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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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