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Background and Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Carrying Amount
Summary of the fair value and carrying value of debt
Total debt	$ 1,502,155	$ 1,564,923
Carrying Amount | Fixed rate debt
Summary of the fair value and carrying value of debt
Total debt	1,040,155	814,423
Carrying Amount | Floating rate debt
Summary of the fair value and carrying value of debt
Total debt	462,000	750,500
Fair Value
Summary of the fair value and carrying value of debt
Total debt	1,532,000	1,618,000
Fair Value | Fixed rate debt
Summary of the fair value and carrying value of debt
Total debt	1,070,000	857,000
Fair Value | Floating rate debt
Summary of the fair value and carrying value of debt
Total debt	$ 462,000	$ 761,000

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ 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=28364263&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=28364263&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
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