Fair Value of Assets and Liabilities (Details Textual) (Senior Notes)	Sep. 30, 2014	Sep. 25, 2014	Dec. 31, 2013
5.875% Senior Notes, Due 2022
Debt Instrument [Line Items]
Interest rate	5.875%		5.875%
5.875% Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest rate	5.875%	5.875%	5.875%
7.75% Senior Notes
Debt Instrument [Line Items]
Interest rate	7.75%
6.625% Senior Notes, Due 2021
Debt Instrument [Line Items]
Interest rate	6.625%	6.625%	6.625%
5.125% Senior Notes, Due 2023
Debt Instrument [Line Items]
Interest rate	5.125%		5.125%