Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 59,749	$ 77,342
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	64,269	58,360
Loss on available-for-sale securities	12,121
Amortization of debt discount	6,713
Non-cash stock-based compensation expense	5,808	5,560
Restructuring on royalty interests in mineral properties		1,328
Gain on distribution to non-controlling interest	(162)	(3,725)
Tax benefit of stock-based compensation exercises	(1,214)	(3,317)
Deferred tax benefit	(5,832)	(714)
Changes in assets and liabilities:
Royalty receivables	(5,073)	(13,258)
Prepaid expenses and other assets	(4,223)	128
Accounts payable	(581)	(316)
Income tax payable (receivable)	(1,349)	3,161
Other liabilities	2,287	(1,647)
Net cash provided by operating activities	132,513	122,902
Cash flows from investing activities:
Acquisition of royalty interests in mineral properties	(277,081)	(193,662)
Proceeds on sale of Inventory - restricted	237	5,514
Other	(55)	(157)
Net cash (used in) investing activities	(276,899)	(188,305)
Cash flows from financing activities:
Proceeds from the issuance of common stock	473,771	271,440
Borrowing from credit facility		100,000
Repayment of debt		(211,700)
Common stock dividends	(30,925)	(20,554)
Distribution to non-controlling interests	(2,027)	(7,917)
Tax benefit of stock-based compensation exercises	1,214	3,317
Net cash provided by financing activities	442,033	134,586
Net increase in cash and equivalents	297,647	69,183
Cash and equivalents at beginning of period	375,456	114,155
Cash and equivalents at end of period	$ 673,103	$ 183,338