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Debt and Credit Facilities - Summary of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Nov. 14, 2015
Debt Instrument [Line Items]      
Long-term debt $ 232,956 $ 232,363  
7.875% senior secured notes due April 15, 2019      
Debt Instrument [Line Items]      
Interest on Senior Secured Notes (as a percent) 7.875% 7.875% 7.875%