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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Details) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Fair Value Measurements [Member]	Dec. 31, 2013 Fair Value Measurements [Member]	Jun. 30, 2014 Fair Value Measurements [Member] Level 1 [Member]	Dec. 31, 2013 Fair Value Measurements [Member] Level 1 [Member]	Jun. 30, 2014 Fair Value Measurements [Member] Level 2 [Member]	Dec. 31, 2013 Fair Value Measurements [Member] Level 2 [Member]	Jun. 30, 2014 Fair Value Measurements [Member] Level 3 [Member]	Dec. 31, 2013 Fair Value Measurements [Member] Level 3 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Long-lived assets held and used and held for sale, Fair Value Measurements					$ 110,500,000	$ 164,200,000	$ 0	$ 0	$ 0	$ 0	$ 110,500,000	$ 164,200,000
Unconsolidated joint venture investments, Fair Value Measurements					26,800,000	35,300,000	0	0	0	0	26,800,000	35,300,000
Long-lived assets held and used and held for sale, Total Losses					25,200,000	72,600,000
Unconsolidated joint venture investments, Total Losses	$ 0	$ 0	$ 9,100,000	$ 0	$ 9,100,000	$ 1,000,000

X

- Definition

Amount of write-down of assets recognized into earnings included in continuing operations and discontinued operations.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Fair value of long lived assets held and used and held for sale.

+ References

No definition available.

+ Details

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X

- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 35

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32787-111569

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X

- Definition

Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

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