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Senior Notes Payable and Other Debt (Details 1) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations [Abstract]  
2011$ 243,498 
20121,042,260 
2013916,733 
2014260,889 
2015868,295 
Thereafter2,734,181 
Total maturities6,065,8562,926,954
Principal Amount Due at Maturity [Member]
  
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations [Abstract]  
2011230,700 
2012517,913 
2013872,623 
2014220,891 
2015835,792 
Thereafter2,539,451 
Total maturities5,217,370 
Unsecured Revolving Credit Facilities [Member]
  
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations [Abstract]  
20110[1] 
2012474,000[1] 
20130[1] 
20140[1] 
20150[1] 
Thereafter0[1] 
Total maturities474,000[1] 
Scheduled Periodic Amortization [Member]
  
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations [Abstract]  
201112,798 
201250,347 
201344,110 
201439,998 
201532,503 
Thereafter194,730 
Total maturities$ 374,486 
[1]At September 30, 2011, we had $57.5 million of unrestricted cash and cash equivalents, for $416.5 million of net borrowings outstanding under our unsecured revolving credit facilities. On October 18, 2011, we repaid all borrowings outstanding and terminated the commitments under our unsecured revolving credit facilities and entered into a new $2.0 billion unsecured revolving credit facility due 2015. See "Unsecured Revolving Credit Facilities and Term Loans" below.