Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ (37,355)	$ 13,127
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion	14,734	17,850
Impairment	47,469	0
Amortization of debt issuance costs	186	141
Non-cash unit-based compensation	1,930	1,878
Changes in operating assets and liabilities:
Royalty income receivable	1,418	(1,663)
Accounts payable—related party	(2)	0
Accounts payable and other accrued liabilities	1,307	(946)
Prepaid expenses and other current assets	314	(214)
Net cash provided by operating activities	30,001	30,173
Cash flows from investing activities:
Acquisition of royalty interests	(11,319)	0
Other	0	77
Net cash provided by (used in) investing activities	(11,319)	77
Cash flows from financing activities
Proceeds from borrowings under credit facility	17,000	0
Debt issuance costs	(20)	(301)
Distribution to partners	(30,057)	(35,071)
Net cash used in financing activities	(13,077)	(35,372)
Net increase (decrease) in cash	5,605	(5,122)
Cash and cash equivalents at beginning of period	539	15,110
Cash and cash equivalents at end of period	6,144	9,988
Supplemental disclosure of cash flow information:
Interest paid, net of capitalized interest	$ 708	$ 234