Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 52,852	$ 50,390
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	42,620	38,639
Gain on distribution to non-controlling interest	(88)	(3,284)
Non-cash stock-based compensation expense	3,900	4,066
Tax benefit of stock-based compensation exercises	(1,214)	(3,086)
Restructuring on royalty interests in mineral properties		1,328
Deferred tax benefit	(2,166)	(847)
Amortization of debt discount	4,448
Changes in assets and liabilities:
Royalty receivables	(16,808)	(15,693)
Prepaid expenses and other assets	(19,659)	1,385
Accounts payable	(661)	(194)
Income tax receivable	1,827	1,947
Other liabilities	(626)	785
Net cash provided by operating activities	64,425	75,436
Cash flows from investing activities:
Acquisition of royalty interests in mineral properties	(215,032)	(148,182)
Proceeds on sale of Inventory - restricted	118	4,842
Other	(38)	(128)
Net cash (used in) investing activities	(214,952)	(143,468)
Cash flows from financing activities:
Borrowing from credit facility		100,000
Repayment of debt		(37,800)
Common stock dividends	(17,915)	(12,209)
Distribution to non-controlling interests	(1,273)	(6,315)
Proceeds from the issuance of common stock	473,776	2,917
Tax benefit of stock-based compensation exercises	1,214	3,086
Net cash provided by financing activities	455,802	49,679
Net increase (decrease) in cash and equivalents	305,275	(18,353)
Cash and equivalents at beginning of period	375,456	114,155
Cash and equivalents at end of period	$ 680,731	$ 95,802