Derivative Financial Instruments (Fair Value Of Derivative Instruments Included In Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 15,229	$ 22,137
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	9,286	13,398
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 5,943	$ 8,739

Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant