Long Term Debt (Details Textuals 2) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Debt Instrument [Line Items]
2022 Notes escrowed proceeds	$ 245.1
7.125% Senior Subordinated Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 24, 2012
Debt Instrument, Face Amount	$ 250.0
Debt Instrument, Interest Rate, Stated Percentage	7.125%
Debt Instrument, Call Date, Earliest	Jun. 01, 2015
Debt Instrument Call Date Mid	Jun. 01, 2019
Debt Instrument, Call Date, Latest	Jun. 01, 2020
Debt Instrument, Maturity Date	Jun. 01, 2022
Selling Priceof Debt Instrument	100.00%
Debt Instrument, Interest Rate, Effective Percentage	7.125%
Redemption Price For Early Redepemption	107.125%
Redemption Amount	35.00%
Redemption Price 1	103.563%
Redemption Price 2	102.375%
Redemption Price 3	101.188%
Redemption Price 4	100.00%