Consolidated Statements of Cash Flows (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net income	$ 42,698	$ 14,590	$ 78,890	$ 27,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and amortization	15,660	16,628	31,723	35,129
(Gain)/loss on disposal of property, plant and equipment	(207)	9	(226)	(208)
Accretion of asset retirement obligation	145	133	286	263
Amortization of debt issuance costs	246	245	491	490
Stock based compensation and other benefits	2,689	2,523	5,789	5,489
Changes in operating assets and liabilities:
Inventories	(15,505)	(13,243)	(55,569)	(20,178)
Trade receivables	81	835	(393)	(4,222)
Accrued compensation and benefits	3,051	202	4,341	(457)
Accounts payable	1,450	1,739	4,644	5,383
Property, production and franchise taxes payable	1,273	(624)	2,944	641
Income taxes payable	5,737	239	9,821	472
Workers compensation	(78)	875	(554)	1,749
Restricted cash			3,000	(25)
Other	1,571	(3,049)	7,496	(1,610)
Net cash provided by operating activities	58,811	21,102	92,683	50,865
Cash flows from investing activities
Capital expenditures	(23,110)	(13,860)	(46,295)	(24,587)
Purchase of long-term investment			(616)
Proceeds from disposal of property, plant and equipment	207		228	265
Purchases of short-term investments	(32,801)	(82,586)	(98,096)	(126,632)
Proceeds from maturities of short-term investments	58,575		137,017	12,973
Net cash provided by (used in) investing activities	2,871	(96,446)	(7,762)	(137,981)
Cash flows from financing activities
Issuance of common stock	7	190	725	441
Net cash provided by financing activities	7	190	725	441
Cash and cash equivalents
Net increase (decrease)	61,689	(75,154)	85,646	(86,675)
Balance at beginning of period	43,320	155,135	19,363	166,656
Balance at end of period	$ 105,009	$ 79,981	$ 105,009	$ 79,981

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