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Derivative Financial Instruments (Narrative) (Details) In Thousands, unless otherwise specified	Jun. 30, 2013 Short [Member] USD ($)	Dec. 31, 2012 Short [Member] USD ($)	Jun. 30, 2013 Long [Member] USD ($)	Dec. 31, 2012 Long [Member] USD ($)	Jun. 30, 2013 TBAs [Member] USD ($)	Jun. 30, 2013 Foreign currency forward contracts [Member] JPY (¥)	Dec. 31, 2012 Foreign currency forward contracts [Member] JPY (¥)
Derivative [Line Items]
Derivative, Notional Amount	$ 92,010	$ 40,125	$ 82,088	$ 32,794	$ 365,800	¥ 1,250,000	¥ 0

X

- 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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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration