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Condensed Consolidated Statements of Cash Flows - Parenthetical
Jun. 30, 2017
Apr. 12, 2017
Dec. 31, 2016
Jun. 30, 2016
7.875% senior secured notes due April 15, 2019 | Senior Notes        
Interest on Senior Secured Notes (as a percent) 7.875% 7.875% 7.875% 7.875%