Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 92,425	$ (82,438)	$ 52,678
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	159,636	141,108	93,486
Amortization of debt discount and issuance costs	13,825	12,985	12,100
Non-cash employee stock compensation expense	9,983	10,039	5,141
Impairment of stream and royalty interests and royalty receivables		98,588	31,335
Tax (benefit) expense of stock-based compensation exercises	(975)	548	(364)
(Gain) loss on available-for-sale securities		(2,340)	183
Deferred tax benefit	1,556	(4,983)	(27,651)
Other	(4,874)	(390)	(46)
Changes in assets and liabilities:
Royalty receivables	(5,472)	17,221	5,977
Stream inventory	1,606	(7,203)	1,110
Income tax receivable	(13,056)	(14,637)	12,808
Prepaid expenses and other assets	(1,691)	(153)	2,527
Accounts payable	(206)	(849)	150
Income tax payable	2,475	460	2,717
Uncertain tax positions	8,631	1,867	1,405
Other liabilities	2,015	36	(1,457)
Net cash provided by operating activities	265,878	169,859	192,099
Cash flows from investing activities:
Acquisition of stream and royalty interests	(203,721)	(1,346,109)	(60,429)
Andacollo royalty termination		345,000
Golden Star term loan		(20,000)
Proceeds from sale of available-for-sale securities		11,905
Tulsequah stream termination			10,000
Other	3,605	(309)	(773)
Net cash used in investing activities	(200,116)	(1,009,513)	(51,202)
Cash flows from financing activities:
Borrowings from revolving credit facility	70,000	350,000
Repayment of revolving credit facility	(95,000)	(75,000)
Net (payments) proceeds from issuance of common stock	(2,426)	(353)	775
Common stock dividends	(61,396)	(58,720)	(56,054)
Purchase of additional royalty interest from non-controlling interest	(2,518)
Debt issuance costs	(3,340)	(1,111)	(864)
Tax (benefit) expense of stock-based compensation exercises	975	(548)	364
Other	(2,843)	(830)	(1,805)
Net cash (used in) provided by financing activities	(96,548)	213,438	(57,584)
Net (decrease) increase in cash and equivalents	(30,786)	(626,216)	83,313
Cash and equivalents at beginning of period	116,633	742,849	659,536
Cash and equivalents at end of period	$ 85,847	$ 116,633	$ 742,849