Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2013
Business and Basis of Presentation
Consolidation, Policy	Our consolidated financial statements reflect all of our accounts, including those of our controlled subsidiaries. The portion of equity in a subsidiary that is not attributable, directly or indirectly, to us is presented as noncontrolling interests. All significant intercompany accounts and transactions have been eliminated. When we obtain an economic interest in an entity, we evaluate the entity to determine if it is a variable interest entity (“VIE”) and, if so, whether we are the primary beneficiary and are therefore required to consolidate the entity. We performed an analysis of all of our subsidiary entities to determine whether they qualify as VIEs and whether they should be consolidated or accounted for as equity investments in an unconsolidated venture. As a result of our assessment, we have concluded that none of our subsidiaries is a VIE. All our subsidiaries are either consolidated or accounted for as equity investments under the voting interest entity model.
Derivatives Instruments, Policy	We measure derivative instruments at fair value and record them as assets or liabilities, depending on our rights or obligations under the applicable derivative contract. Derivatives that are not designated as hedges must be adjusted to fair value through earnings. For a derivative designated and that qualified as a cash flow hedge, the effective portion of the change in fair value of the derivative is recognized in Other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of the derivative's change in fair value is immediately recognized in earnings.
Equity Method Investments, Policy	Under the conventional approach of accounting for equity method investments, an investor applies its percentage ownership interest to the venture's net income to determine the investor's share of the earnings or losses of the venture. This approach is inappropriate to use if the venture's capital structure gives different rights and priorities to its investors. We have priority returns on our equity method investments. Therefore, we follow the hypothetical liquidation at book value method in determining our share of the ventures' earnings or losses for the reporting period as this method better reflects our claim on the ventures' book value at the end of each reporting period. Earnings for our equity method investments are recognized in accordance with each respective investment agreement and, where applicable, based upon the allocation of the investment's net assets at book value as if the investment were hypothetically liquidated at the end of each reporting period. Due to our preferred interests, we are not responsible for, and will not reflect, losses to the extent our partners continue to have equity in the investments.
Fair Value of Financial Instruments, Policy	The fair value of an asset is defined as the exit price, which is the amount that would either be received when an asset is sold or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The guidance establishes a three-tier fair value hierarchy based on the inputs used in measuring fair value. These tiers are: Level 1, for which quoted market prices for identical instruments are available in active markets, such as money market funds, equity securities and U.S. Treasury securities; Level 2, for which there are inputs other than quoted prices included within Level 1 that are observable for the instrument, such as certain derivative instruments including interest rate caps and swaps; and Level 3, for securities that do not fall into Level 1 or Level 2 and for which little or no market data exists, therefore requiring us to develop our own assumptions.
New Accounting Policy, Policy	Recent Accounting Requirements The following Accounting Standards Updates (“ASUs”) promulgated by the Financial Accounting Standards Board (“FASB”) are applicable to us as indicated: ASU 2013-01, Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities — In January 2013, the FASB issued an update to ASU 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities. ASU 2013-01 clarifies that the scope of ASU 2011-11 applies to derivatives accounted for in accordance with Topic 815, Derivatives and Hedging, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset in accordance with Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting or similar arrangement. These amendments did not have a significant impact on our financial position or results of operations and are applicable to us for our interim and annual reports beginning in 2013 and has been applied retrospectively. ASU 2013-02, Other Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income — In February 2013, the FASB issued ASU 2013-02 requiring entities to disclose additional information about items reclassified out of accumulated other comprehensive income. This ASU impacts the form of our disclosures only, is applicable to us for our interim and annual reports beginning in 2013, and has been applied retrospectively. The related additional disclosures are located in the consolidated statements of comprehensive loss. ASU 2013-10, Derivatives and Hedging (Topic 815): Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes, a Consensus of the FASB Emerging Issues Task Force — In July 2013, the FASB issued ASU 2013-10, which permits the Fed Funds Effective Swap Rate, also referred to as the “Overnight Index Swap Rate,” to be used as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815, in addition to the U.S. government and London Interbank Offered Rate (“LIBOR”) swap rate. The update also removes the restriction on the use of different benchmark rates for similar hedges. This ASU will be applicable to us for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. Through the date of this Report, we have not entered into any transactions to which this ASU applies.

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02, 03

-Article 3A

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 40

-Section 45

-URI http://asc.fasb.org/section&trid=2197723

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2196966

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-URI http://asc.fasb.org/subtopic&trid=2197087

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.3A-02)

-URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355033-122828

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33801-111570

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=18733093&loc=d3e5614-111684

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph k

-Article 1

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- Definition

Disclosure of accounting policy for its derivative instruments and hedging activities.

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- Definition

Disclosure of accounting policy for the equity method of accounting for investments in common stock or other interests including unconsolidated subsidiaries, corporate joint ventures, noncontrolling interests in real estate ventures, limited partnerships, and limited liability companies. The accounting policy may include information such as: (1) initially recording an investment in the stock of an investee at cost; (2) adjusting the carrying amount of the investment to recognize the investor's share of the earnings or losses of the investee after the date of acquisition; and (3) adjustments to reflect the investor's share of changes in the investee's capital (dividends). This disclosure may also include a detailed description of the policy for determining the amount of equity method losses recognized after an investment has been reduced to zero as a result of previous losses, reasons for not using the equity method when the investor company owns 20 percent or more of the voting stock of the investee's company (including identification of the significant investee), reasons for using the equity method when the ownership percentage is less than 20 percent, and discussion of recognition of equity method losses when an investor's total investment in an investee includes, in addition to an investment in common stock, other investments such as preferred stock and loans to the investee. An entity also may describe how such investments are assessed for impairment.

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