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Derivative Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013
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Derivative [Line Items] |
Derivative, Total Notional Amount | $ 721,438
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |
Derivative [Line Items] |
Derivative, Total Notional Amount | 200,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |
Derivative [Line Items] |
Derivative, Total Notional Amount | $ 521,438

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

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration