Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements (Tables) [Abstract]


			Fair Value Measurements Using:
			Quoted Market		Significant Other		Significant
	Total Carrying		Prices in Active		Observable Inputs		Unobservable Inputs
	Value		Markets (Level 1)		(Level 2)		(Level 3)
As of June 30, 2011
Cash equivalents(1)	$	1,993,951	$	1,993,951	$	—	$	—
Interest rate caps(2)	$	1,316	$	—	$	1,316	$	—
As of December 31, 2010
Cash equivalents(1)	$	2,490,809	$	2,490,809	$	—	$	—
Interest rate caps(2)	$	1,617	$	—	$	1,617	$	—


(1)		The Company has short-term investments classified as cash equivalents as the original maturities are less than 90 days.

(2)		As of June 30, 2011 and December 31, 2010, the Company has 38 and 34 interest rate cap agreements with an aggregate fair value of approximately $1.3 million and $1.6 million, respectively, based on quoted market values from the institutions holding the agreements.

- Definition

This item represents certain of the disclosures concerning the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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