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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - Senior Secured Notes
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 13, 2015
Mar. 10, 2015
Jul. 01, 2013
Jun. 05, 2013
6.875% Senior Secured Notes                
Interest rate (percent) 6.875% 6.875% 6.875%   6.875% 6.875%    
8.25% Senior Secured Notes                
Interest rate (percent) 8.25%   8.25% 8.25% 8.25%   8.25% 8.25%