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Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Interest and Debt Expense [Abstract]
Interest incurred on debt	$ 6,097	$ 5,306	$ 18,183	$ 15,020
Accretion of fair value adjustment on Senior Notes	1,618	1,581	4,826	4,715
Amortization of debt issuance costs	77	77	231	125
Total interest expense	$ 7,792	$ 6,964	$ 23,240	$ 19,860
Effective interest rate, revolving credit facility			5.99%		5.52%
Stated interest rate	6.375%		6.375%

X

- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The effective interest rate during the reporting period.

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