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Debt and Credit Facilities - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Apr. 12, 2017	Dec. 31, 2016	Sep. 30, 2016
Debt Instrument [Line Items]
Long-term debt	$ 164,565		$ 233,154
Current portion of long-term debt	3,184		0
7.875% senior secured notes due April 15, 2019 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 0		233,154
Interest on Senior Secured Notes (as a percent)	7.875%	7.875%		7.875%
Term Loan Facility \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 167,749		$ 0
Current portion of long-term debt	3,200
Deferred financing cost, current	600
Long-term debt excluding current maturities	164,600
Deferred financing cost, noncurrent	2,400
Debt discount, noncurrent	$ 2,600