Condensed Consolidating Financial Information (Details Textual)	Mar. 31, 2016	Dec. 31, 2015	Mar. 19, 2013
Debt Instrument [Line Items]
Percentage of subsidiary owned	100.00%
Senior Notes | 6.625% Senior Notes
Debt Instrument [Line Items]
Notes bear interest at a rate	6.625%	6.625%
Senior Notes | Senior Notes Due 2023
Debt Instrument [Line Items]
Notes bear interest at a rate			5.125%
Senior Notes | 5.875% Senior Notes, Due 2022
Debt Instrument [Line Items]
Notes bear interest at a rate	5.875%	5.875%