Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 25,294	$ 26,141
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	21,500	17,221
Gain on distribution to non-controlling interest	(88)	(3,018)
Non-cash stock-based compensation expense	2,095	2,198
Tax benefit of stock-based compensation exercises	(773)	(1,567)
Restructuring on royalty interests in mineral properties		1,328
Deferred tax expense	1,746	508
Amortization of debt discount	2,192
Changes in assets and liabilities:
Royalty receivables	(10,789)	(5,950)
Prepaid expenses and other assets	(249)	197
Accounts payable	53	70
Income taxes payable	10,309	9,762
Other liabilities	2,252	(716)
Net cash provided by operating activities	53,542	46,174
Cash flows from investing activities:
Acquisition of royalty interests in mineral properties	(120,035)
Proceeds on sale of Inventory - restricted	118	4,455
Other	(17)	(111)
Net cash (used in) provided by investing activities	(119,934)	4,344
Cash flows from financing activities:
Repayment of debt		(33,900)
Common stock dividends	(8,949)	(6,095)
Distribution to non-controlling interests	(562)	(5,380)
Proceeds from the issuance of common stock	1,711	2,536
Tax benefit of stock-based compensation exercises	773	1,567
Net cash used in financing activities	(7,027)	(41,272)
Net increase (decrease) in cash and equivalents	(73,419)	9,246
Cash and equivalents at beginning of period	375,456	114,155
Cash and equivalents at end of period	$ 302,037	$ 123,401