Quarterly report pursuant to Section 13 or 15(d)

Notes Payable (Details)

v2.4.0.6
Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 15, 2013
Unsecured Debt [Member]
5.125% unsecured notes [Member]
Mar. 31, 2013
Unsecured Debt [Member]
5.125% unsecured notes [Member]
Debt Instrument [Line Items]        
Repayments of Unsecured Debt $ 60,000 $ 0 $ 60,000  
Interest rate, stated percentage     5.125% 5.125%