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Condensed Consolidating Financial Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 17, 2012
Jun. 30, 2011
Condensed Financial Statements, Captions [Line Items]        
Long-term Debt, Gross $ 2,706,000 $ 2,780,000    
Parent Percentage of Ownership in Guarantor Subsidiaries 100.00%      
7.75% Senior Notes [Member]        
Condensed Financial Statements, Captions [Line Items]        
Long-term Debt, Gross       $ 700,000
Debt Instrument, Interest Rate, Stated Percentage 7.75%     7.75%
4.75% Senior Notes [Member]        
Condensed Financial Statements, Captions [Line Items]        
Long-term Debt, Gross     $ 600,000  
Debt Instrument, Interest Rate, Stated Percentage 4.75%   4.75%