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Derivative Financial Instruments (Narrative) (Details) In Thousands, unless otherwise specified | Dec. 31, 2013 Short [Member] USD ($) | Dec. 31, 2012 Short [Member] USD ($) | Dec. 31, 2013 Long [Member] USD ($) | Dec. 31, 2012 Long [Member] USD ($) | Dec. 31, 2013 TBAs [Member] USD ($) | Dec. 31, 2013 Foreign currency forward contracts [Member] JPY (¥) | Dec. 31, 2012 Foreign currency forward contracts [Member] JPY (¥) | Dec. 31, 2013 EuroDollar futures contracts [Member] USD ($) | Dec. 31, 2012 EuroDollar futures contracts [Member] USD ($)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 66,300 | $ 40,125 | $ 57,108 | $ 32,794 | $ 227,700 | ¥ 1,250,000 | ¥ 0 | $ 0 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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