Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 77,342	$ 54,027
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	58,360	50,768
Gain on distribution to non-controlling interest	(3,725)	(2,798)
Non-cash stock-based compensation expense	5,560	5,010
Tax benefit of stock-based compensation exercises	(3,317)	(1,031)
Restructuring on royalty interests in mineral properties	1,328
Deferred tax benefit	(714)	(1,680)
Changes in assets and liabilities:
Royalty receivables	(13,258)	(6,139)
Prepaid expenses and other assets	128	(223)
Accounts payable	(316)	(201)
Income taxes payable (receivable)	3,161	(901)
Other liabilities	(1,647)	5,519
Net cash provided by operating activities	122,902	102,351
Cash flows from investing activities:
Acquisition of royalty interests in mineral properties	(193,662)	(279,500)
Proceeds on sale of Inventory - restricted	5,514	4,396
Deferred acquisition costs		(2,083)
Other	(157)	1,348
Net cash (used in) investing activities	(188,305)	(275,839)
Cash flows from financing activities:
Borrowing from credit facility	100,000	19,500
Repayment of debt	(211,700)	(23,000)
Common stock dividends	(20,554)	(16,042)
Distribution to non-controlling interests	(7,917)	(6,068)
Proceeds from the issuance of common stock	271,440
Tax benefit of stock-based compensation exercises	3,317	1,031
Other		(1,008)
Net cash provided by (used in) financing activities	134,586	(25,587)
Net increase (decrease) in cash and equivalents	69,183	(199,075)
Cash and equivalents at beginning of period	114,155	324,846
Cash and equivalents at end of period	$ 183,338	$ 125,771