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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%