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Notes Payable (Details) (USD $)
9 Months Ended1 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
2021 Notes [Member]
Sep. 30, 2011
2026 Notes [Member]
Notes Payable [Line Items]     
Notes face value   $ 300,000,000 
Note discount amount to be amortized5,167,000 1,118,0004,269,000 
Proceeds from notes payable295,731,000  292,956,000 
Stated interest rate   5.50%3.95%
Effective rate   5.69% 
Purchase price of notes sold   295,731,000 
Notional amount   150,000,000 
Maturity date of debt instrument   July 20212026
Liability amount from termination of hedge agreement 5,300,000   
Liability amount from termination of hedge agreement, comprehensive income 5,218,000   
Debt instrument surrender date    September 19, 2011
Debt issuance cost$ 5,464,000  $ 2,775,000 
Next put option for holders date    September 2016