Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22,888us-gaap_ProfitLoss	$ 19,039us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and amortization	17,121	15,151
Loss (gain) on disposal of property, plant and equipment	3	(238)
Loss on long-term investments	55us-gaap_GainLossOnInvestments	0us-gaap_GainLossOnInvestments
Amortization/accretion on investment premium/discount	420	574
Deferred taxes	(12,409)	(2,131)
Foreign currency transaction loss (gain), net	608	(4,179)
Accretion of asset retirement obligation	191	181
Amortization of deferred debt issuance costs	303	364
Accretion of convertible debenture debt discount	4,525	4,170
Share based compensation and other benefits	3,438	3,180
Non-cash capitalized interest	(866)us-gaap_OtherNoncashIncomeExpense	(679)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Inventories	5,997us-gaap_IncreaseDecreaseInInventories	(6,133)us-gaap_IncreaseDecreaseInInventories
Trade receivables	125	(19,883)
Prepaids	1,183	2,039
Accrued compensation and benefits	(2,152)	(1,164)
Accounts payable	(2,043)	(7,579)
Property, production and franchise taxes payable	794	1,070
Income taxes payable	0	1,683
Accrued workers compensation	(146)	(33)
Other operating assets	(1,879)	(4,234)
Other operating liabilities	156	3,567
NET CASH PROVIDED BY OPERATING ACTIVITIES	38,312	4,765
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(27,902)	(26,133)
Proceeds from disposal of property, plant and equipment	0	259
Purchases of investments	(57,371)	(76,352)
Proceeds from maturities of investments	29,839	35,419
NET CASH USED IN INVESTING ACTIVITIES	(55,434)	(66,807)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments on debt and capital lease obligations	(584)	(557)
Proceeds from issuance of common stock	28	536
NET CASH USED IN FINANCING ACTIVITIES	(556)	(21)
CASH AND CASH EQUIVALENTS
Net decrease	(17,678)	(62,063)
Balance at beginning of period	280,286	286,687
BALANCE AT END OF PERIOD	$ 262,608	$ 224,624

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Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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