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Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Interest and Debt Expense [Abstract]
Interest incurred on debt	$ 5,870	$ 4,897
Accretion of fair value adjustment on Senior Notes	1,599	1,563
Amortization of debt issuance costs	77	0
Total interest expense	$ 7,546	$ 6,460
Effective interest rate, revolving credit facility	5.74%		5.52%
Stated interest rate	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.

+ References

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- Definition

Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

+ References

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-Number 210
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- Definition

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

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- Definition

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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- Definition

The effective interest rate during the reporting period.

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