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Debt (Summary Of Debt) (Details) (USD $)
9 Months Ended12 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Apr. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Sep. 30, 2011
Revolving Credit Facilities [Member]
Dec. 31, 2010
Revolving Credit Facilities [Member]
Sep. 30, 2011
2006 Senior Unsecured Notes [Member]
Dec. 31, 2010
2006 Senior Unsecured Notes [Member]
Sep. 30, 2011
2011 Senior Unsecured Notes [Member]
Dec. 31, 2010
2011 Senior Unsecured Notes [Member]
Sep. 30, 2011
Exchangeable Senior Notes [Member]
Dec. 31, 2010
Exchangeable Senior Notes [Member]
Dec. 31, 2010
Term Loans [Member]
Sep. 30, 2011
Term Loans [Member]
Debt Instrument [Line Items]              
Principal amount    $ 39,600,000 $ 125,000,000$ 125,000,000$ 450,000,000 $ 20,175,000$ 91,175,000$ 157,683,000$ 14,486,000
Unamortized discount          (248,000)(2,585,000)(1,303,000) 
Debt instrument, net          19,927,00088,590,000156,380,00014,486,000
Total senior notes available$ 649,013,000 $ 369,970,000$ 125,000,000          
Unsecured senior notes, interest rate 6.875%    2.67% 6.875%    6.20%
Interest rate, minimum      7.333%7.333%  6.125%6.125%  
Interest rate, maximum      7.715%7.871%  9.25%9.25%  
Interest rate terms            Various