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Basis of Presentation and Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Carrying Amount
Summary of the fair value and carrying value of debt
Total debt	$ 1,852,568	$ 1,502,155
Carrying Amount | Fixed rate debt
Summary of the fair value and carrying value of debt
Total debt	1,041,068	1,040,155
Carrying Amount | Floating rate debt
Summary of the fair value and carrying value of debt
Total debt	811,500	462,000
Fair Value
Summary of the fair value and carrying value of debt
Total debt	1,890,000	1,532,000
Fair Value | Fixed rate debt
Summary of the fair value and carrying value of debt
Total debt	1,080,000	1,070,000
Fair Value | Floating rate debt
Summary of the fair value and carrying value of debt
Total debt	$ 810,000	$ 462,000

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- 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

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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