Quarterly report pursuant to Section 13 or 15(d)

Restricted Cash (Details Textual)

v2.4.0.8
Restricted Cash (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended
May 31, 2013
Feb. 28, 2013
May 31, 2013
Maximum [Member]
May 14, 2013
Senior Notes [Member]
May 2013 Senior Notes [Member]
Restricted Cash and Cash Equivalents Items [Line Items]        
Percentage of outstanding principal amount, Escrowed       100.00%
Original maturity of restricted cash investments     30 days  
Restricted cash, Carrying Amount $ 1,550.0 $ 0