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Long-Term Debt (Narrative) (Details) (USD $)
9 Months Ended0 Months Ended9 Months Ended0 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Jul. 31, 2004
Senior Notes [Member]
Private Placement [Member]
Sep. 30, 2011
Repayment Of Debt [Member]
Private Placement [Member]
Dec. 31, 2010
Repayment Of Debt [Member]
Private Placement [Member]
Sep. 30, 2011
Acquisition Notes Payable
Sep. 30, 2011
Master Agreement [Member]
Dec. 31, 2010
Master Agreement [Member]
Dec. 22, 2006
Master Agreement [Member]
Series C [Member]
Sep. 30, 2011
Master Agreement [Member]
Series C [Member]
Feb. 01, 2008
Master Agreement [Member]
Series D [Member]
Sep. 30, 2011
Master Agreement [Member]
Series D [Member]
Sep. 30, 2011
Master Agreement [Member]
Series E [Member]
Sep. 30, 2011
Line Of Credit [Member]
Dec. 31, 2010
Line Of Credit [Member]
Sep. 30, 2011
LIBOR [Member]
Dec. 31, 2010
LIBOR [Member]
Sep. 30, 2011
Series A [Member]
Private Placement [Member]
Sep. 30, 2011
Series B [Member]
Private Placement [Member]
Debt Instrument [Line Items]                   
Maximum shelf facility capacity      $ 200,000,000            
Notes redeemed                 100,000,000 
Unsecured senior notes outstanding250,000,000250,000,000200,000,000100,000,000200,000,000 150,000,00050,000,000 25,000,000 25,000,000100,000,000    100,000,000100,000,000
Long-term debt, maturities, repayment terms      ten            
Debt Instrument, Issuance Date         December 22, 2006 February 1, 2008September 15, 2011    September 15, 2004July 15, 2004
Debt Instrument, Maturity DateDec. 22, 2016Jan. 15, 2015Sep. 15, 2018Sep. 15, 2011Jul. 15, 2014
Debt Instrument Interest Rate Stated Percentage         5.66% 5.37%4.50%    5.57%6.08%
Line of credit facility, amount outstanding             00    
Lending commitment amount             50,000,000     
Increase in lending commitment amount, potential             100,000,000     
Availability fees, minimum             0.10%     
Availability fees, maximum             0.20%     
Letter of credit usage fee, minimum             0.50%     
Letter of credit usage fee, maximum             1.00%     
Ninety-day LIBOR rate               0.374%0.30%  
LIBOR below base rate             1.00%     
Interest rate, minimum     0.00%       0.50%     
Interest rate, maximum     4.00%       1.00%     
Additional borrowings             $ 0$ 0