Interest Rate Contracts (Interest Rate Derivatives Designated As Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013 Instruments
Interest Rate Swaps
Derivative [Line Items]
Number of Instruments	7
Notional (in thousands)	$ 1,828,080
Interest Rate Caps
Derivative [Line Items]
Number of Instruments	2
Notional (in thousands)	$ 111,920

Number of interest rate derivative instruments held by the entity at the reporting date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Name:	us-gaap_NumberOfInterestRateDerivativesHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant