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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Debt - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 10, 2016	Apr. 01, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs and discount	$ 649,195			$ 125,000
Unamortized discount	15,635			0
Unamortized debt issuance costs	9,063			227
Long-term debt, net of current portion	624,497			124,773
Senior Notes \| 9.25% senior secured notes, due 2023
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs and discount	$ 645,000			0
Unamortized discount		$ 16,100
Debt instrument, percentage rate	9.25%	9.25%
Senior Notes \| 6.50% notes, due 2021
Debt Instrument [Line Items]
Debt instrument, percentage rate			6.50%
Notes Payable \| 6.50% notes, due 2021
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs and discount	$ 4,195			0
Debt instrument, percentage rate	6.50%		6.50%
Term Loan \| Credit Agreement term loan, due 2016
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs and discount	$ 0			$ 125,000