Schedule of Interest Rate Derivatives (Details) (USD $)	3 Months Ended		6 Months Ended														3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Interest Rate Swaps Not Designated as Hedging Instrument	Dec. 31, 2011 Interest Rate Swaps Not Designated as Hedging Instrument	Jun. 30, 2012 Interest Rate Swaps Not Designated as Hedging Instrument Accounts payable and accrued liabilities	Dec. 31, 2011 Interest Rate Swaps Not Designated as Hedging Instrument Accounts payable and accrued liabilities	Jun. 30, 2012 Interest Rate Swaps Not Designated as Hedging Instrument Other non-current liabilities	Dec. 31, 2011 Interest Rate Swaps Not Designated as Hedging Instrument Other non-current liabilities	Jun. 30, 2012 Interest Rate Caps Not Designated as Hedging Instrument	Dec. 31, 2011 Interest Rate Caps Not Designated as Hedging Instrument	Jun. 30, 2012 Interest Rate Caps Not Designated as Hedging Instrument Prepaid expenses and other current assets	Dec. 31, 2011 Interest Rate Caps Not Designated as Hedging Instrument Prepaid expenses and other current assets	Jun. 30, 2012 Interest Rate Caps Not Designated as Hedging Instrument Other non-current assets	Dec. 31, 2011 Interest Rate Caps Not Designated as Hedging Instrument Other non-current assets	Jun. 30, 2012 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument	Jun. 30, 2011 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument	Jun. 30, 2012 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument	Jun. 30, 2011 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument	Jun. 30, 2012 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Accounts payable and accrued liabilities	Jun. 30, 2011 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Accounts payable and accrued liabilities	Jun. 30, 2012 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Accounts payable and accrued liabilities	Jun. 30, 2011 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Accounts payable and accrued liabilities	Jun. 30, 2012 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Other non-current liabilities	Jun. 30, 2011 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Other non-current liabilities	Jun. 30, 2012 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Other non-current liabilities	Jun. 30, 2011 Interest Expense Interest Rate Swaps Not Designated as Hedging Instrument Other non-current liabilities	Jun. 30, 2012 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument	Jun. 30, 2011 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument	Jun. 30, 2012 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument	Jun. 30, 2011 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument	Jun. 30, 2012 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Prepaid expenses and other current assets	Jun. 30, 2011 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Prepaid expenses and other current assets	Jun. 30, 2012 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Prepaid expenses and other current assets	Jun. 30, 2011 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Prepaid expenses and other current assets	Jun. 30, 2012 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Other non-current assets	Jun. 30, 2011 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Other non-current assets	Jun. 30, 2012 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Other non-current assets	Jun. 30, 2011 Interest Expense Interest Rate Caps Not Designated as Hedging Instrument Other non-current assets
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value					$ (1,840,000)	$ (2,694,000)	$ (1,840,000)	$ (2,269,000)	$ 0	$ (425,000)
Derivative, (Gain) Loss on Derivative, Net																	(602,000)	327,000	(854,000)	(525,000)	(602,000)	(181,000)	(429,000)	(214,000)	0	508,000	(425,000)	(311,000)
Interest Rate Derivative Assets, at Fair Value											0	5,000	0	1,000	0	4,000
Derivative, Loss on Derivative																													0	119,000	5,000	264,000	0	0	1,000	3,000	0	119,000	4,000	261,000
Derivatives Expense Recognized into Earnings for Interest Rate Swaps and Interest Rate Caps, including accrued interest	$ 400,000	$ 2,000,000	$ 1,300,000	$ 2,800,000