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Schedule of Restricted Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Restricted Cash and Cash Equivalents Held By Broker Counterparties For Securities Trading Activity | $ 9,000 | $ 9,000 |
| Restricted Cash and Cash equivalents Held by Broker Counterparties For Derivatives Trading Activity | 138,934 | 208,669 |
| Restricted Cash and Cash Equivalents Held By Repurchase Counterparties as Restricted Collateral | 129,148 | 84,307 |
| Restricted Cash and Cash Equivalents Held by Broker and Repurchase Counterparties | 277,082 | 301,976 |
| Restricted Cash and Cash Equivalents, Noncurrent | 346 | 346 |
| Restricted Cash and Cash Equivalents | $ 277,428 | $ 302,322 |
| X | ||||||||||
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- Definition
The total amount of cash and cash equivalent items held by broker counterparties for derivatives and securities trading activity, and repurchase counterparties as restricted collateral. No definition available.
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| X | ||||||||||
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- Definition
The carrying amounts of cash and cash equivalent items held by broker counterparties for derivatives trading activity. No definition available.
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| X | ||||||||||
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- Definition
The carrying amounts of cash and cash equivalent items held by broker counterparties for securities trading activity. No definition available.
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| X | ||||||||||
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- Definition
The carrying amounts of cash and cash equivalent items held by repurchase counterparties as restricted collateral. No definition available.
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| X | ||||||||||
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- Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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