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Consolidated Statements of Cash Flows (Parenthetical)
Dec. 31, 2016
Dec. 31, 2015
Aug. 13, 2015
Dec. 31, 2014
Dec. 12, 2014
Sep. 26, 2014
4.875% Senior Notes [Member]            
Debt instrument, interest rate 4.875% 4.875% 4.875%      
5.25% Senior Notes [Member]            
Debt instrument, interest rate 5.25% 5.25%   5.25% 5.25% 5.25%
6.625% senior notes [Member]            
Debt instrument, interest rate 6.625%     6.625%