Long-Term Debt Additional Detail (Details) (Senior Notes [Member], 5.5% Senior Notes due 2022 [Member])	9 Months Ended
	Sep. 30, 2013
Debt Instrument, Redemption [Line Items]
Change in control terms, redemption price percentage	101.00%
August 1, 2017 to July 31, 2018
Debt Instrument, Redemption [Line Items]
Redemption price percentage	102.75%
August 1, 2018 to July 31, 2019
Debt Instrument, Redemption [Line Items]
Redemption price percentage	101.375%
August 1, 2019 and thereafter
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%
Prior to August 1, 2016 [Member]
Debt Instrument, Redemption [Line Items]
Maximum Redemption Percent Allowed From Equity Offering	35.00%
Redemption price percentage	105.00%
Prior to August 1, 2017 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%