Condensed Consolidating Financial Information (Details Textual)	Sep. 30, 2013	Mar. 19, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Notes bear interest at a rate	7.75%
Percentage of subsidiary owned	100.00%
Senior Notes Due 2021
Debt Instrument [Line Items]
Notes bear interest at a rate	6.625%		6.625%
Senior Notes Due 2023
Debt Instrument [Line Items]
Notes bear interest at a rate	5.125%	5.125%	5.125%
7.75% Senior Notes
Debt Instrument [Line Items]
Notes bear interest at a rate	7.75%