Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net (loss) income	$ (119,351)	$ 92,425	$ (82,438)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	163,696	159,636	141,108
Amortization of debt discount and issuance costs	15,046	13,825	12,985
Non-cash employee stock compensation expense	8,279	9,983	10,039
Impairment of stream and royalty interests	239,364		98,588
Gain on available-for-sale securities			(2,340)
Deferred tax benefit	(32,843)	1,556	(4,983)
Other	(197)	(4,874)	(390)
Changes in assets and liabilities:
Royalty receivables	530	(6,883)	19,508
Stream inventory	(1,428)	1,606	(7,203)
Income tax receivable	22,130	(13,056)	(14,637)
Prepaid expenses and other assets	2,813	(1,691)	(153)
Accounts payable	5,173	(206)	(849)
Income tax payable	12,601	2,475	460
Withholding taxes payable	(171)	1,411	(2,486)
Uncertain tax positions	7,767	8,631	1,867
Other liabilities	5,415	2,015	235
Net cash provided by operating activities	328,824	266,853	169,311
Cash flows from investing activities:
Acquisition of stream and royalty interests	(11,812)	(203,721)	(1,346,109)
Repayment of Golden Star term loan	20,000
Purchase of available-for-sale securities	(17,869)
Andacollo royalty termination			345,000
Golden Star term loan			(20,000)
Sale of available-for-sale securities			11,905
Other	(909)	3,605	(309)
Net cash used in investing activities	(10,590)	(200,116)	(1,009,513)
Cash flows from financing activities:
Repayment of revolving credit facility	(250,000)	(95,000)	(75,000)
Net payments from issuance of common stock	(4,042)	(2,426)	(353)
Common stock dividends	(64,118)	(61,396)	(58,720)
Debt issuance costs	(180)	(3,340)	(1,111)
Borrowings from revolving credit facility		70,000	350,000
Purchase of additional royalty interest from non-controlling interest		(2,518)
Other	3,009	(2,843)	(830)
Net cash (used in) provided by financing activities	(315,331)	(97,523)	213,986
Net increase (decrease) in cash and equivalents	2,903	(30,786)	(626,216)
Cash and equivalents at beginning of period	85,847	116,633	742,849
Cash and equivalents at end of period	$ 88,750	$ 85,847	$ 116,633