Subsequent Events (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 5.375 Percent Notes [Member]	Oct. 03, 2012 5.375 Percent Notes [Member]	Sep. 30, 2012 7.125 Percent Notes Due November 2016 [Member]
Subsequent Events (Textual) [Abstract]
Aggregate principal amount of private placement offering				$ 250.0	$ 200.0
Net proceeds offering amount			246.3
Percentage of aggregate principal amount of outstanding	7.125%	7.125%	5.375%	5.375%	7.125%
Maturity Date of Senior Notes			Oct. 03, 2020
Expected amount covered by insurance	$ 0.5