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Background and Significant Accounting Policies (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying Amount
Summary of the fair value and carrying value of debt
Total debt	$ 1,564,923	$ 1,773,039
Carrying Amount | Fixed rate debt
Summary of the fair value and carrying value of debt
Total debt	814,423	794,039
Carrying Amount | Floating rate debt
Summary of the fair value and carrying value of debt
Total debt	750,500	979,000
Fair Value
Summary of the fair value and carrying value of debt
Total debt	1,618,000	1,781,000
Fair Value | Fixed rate debt
Summary of the fair value and carrying value of debt
Total debt	857,000	792,000
Fair Value | Floating rate debt
Summary of the fair value and carrying value of debt
Total debt	$ 761,000	$ 989,000

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

+ Details

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

X

- Details

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