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Outstanding Short Term Borrowings and Long Term Debt (Detail) (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Apr. 15, 2011
Dec. 31, 2010
Debt Outstanding [Line Items]   
Short-term borrowings  $ 37,245
Long-term debt609,557 1,209,260
5.375% Senior Notes
   
Debt Outstanding [Line Items]   
MaturitySep. 15, 2020  
Principal value350,000  
Senior Notes347,744 347,601
5.70% Senior Notes
   
Debt Outstanding [Line Items]   
MaturityJun. 01, 2012[1]  
Principal value141,429[1]  
Senior Notes145,632[1] 265,613[1]
6.05% Subordinated Notes
   
Debt Outstanding [Line Items]   
MaturityJun. 01, 2017[2]  
Principal value45,964[2]  
Subordinated Notes55,302[2] 285,937[2]
3.875% Convertible Notes
   
Debt Outstanding [Line Items]   
MaturityApr. 15, 2011  
Principal value 250,000 
Convertible notes  249,304
7.0% Junior Subordinated Debentures
   
Debt Outstanding [Line Items]   
MaturityOct. 15, 2033  
Principal value50,000  
Junior subordinated debentures55,416 55,548
4.99% long-term notes payable
   
Debt Outstanding [Line Items]   
MaturityApr. 01, 2012  
Principal value5,463[3]  
Long-term notes payable5,463[3] 5,257[3]
Other short-term borrowings
   
Debt Outstanding [Line Items]   
Short-term borrowings  $ 37,245[4]
[1]At September 30, 2011 and December 31, 2010, included in the carrying value of our 5.70% Senior Notes are $4.2 million and $15.7 million, respectively, related to the fair value of the interest rate swap associated with the notes.
[2]At September 30, 2011 and December 31, 2010, included in the carrying value of our 6.05% Subordinated Notes are $9.1 million and $36.3 million, respectively, related to the fair value of the interest rate swap associated with the notes.
[3]Represents long-term notes payable related to one of our debt fund investments, and was payable beginning April 30, 2009 with the last payment due in April 2012.
[4]At December 31, 2010, represented cash collateral received from counterparties for our interest rate swap agreements related to our 5.70% Senior Notes and 6.05% Subordinated Notes. Due to the repurchase of $312.6 million of these notes and termination of associated portions of interest rate swaps (see discussion below) in May 2011, the notional value of our swaps fell below the $10 million threshold specified in the agreement, and therefore, the full collateral was returned to the counterparties.