Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 207,642	$ 212,175
Accounts receivable:
Trade	26,159	17,672
Other, net	10,650	20,893
Inventories:
Concentrates, doré, and stockpiled ore	22,746	27,740
Materials and supplies	21,112	21,097
Current deferred income taxes	30,946	35,734
Other current assets	13,016	8,324
Total current assets	332,271	343,635
Non-current investments	8,730	7,019
Non-current restricted cash and investments	7,702	5,217
Properties, plant, equipment and mineral interests, net	1,805,632	1,791,601
Non-current deferred income taxes	86,677	78,780
Other non-current assets and deferred charges	9,269	5,867
Total assets	2,250,281	2,232,119
Current liabilities:
Accounts payable and accrued liabilities	39,232	51,152
Accrued payroll and related benefits	17,359	18,769
Accrued taxes	12,619	7,881
Current portion of capital leases	8,482	8,471
Current portion of accrued reclamation and closure costs	58,640	58,425
Other current liabilities	15,228	6,781
Total current liabilities	151,560	151,479
Capital leases	14,112	14,332
Accrued reclamation and closure costs	55,353	46,766
Long-term Debt	491,042	490,726
Non-current deferred tax liability	159,890	164,861
Other non-current liabilities	34,862	37,536
Total liabilities	906,819	905,700
Commitments and contingencies (Notes 2, 4, 7, 9, and 11)
Preferred stock, 5,000,000 shares authorized:
Series B preferred stock, $0.25 par value, 157,816 shares issued and outstanding, liquidation preference — $7,891	39	39
Common stock, $0.25 par value, 500,000,000 shares authorized; issued and outstanding 2014 — 342,840,128 shares and 2013 — 342,663,381 shares	85,943	85,896
Capital surplus	1,431,903	1,426,845
Accumulated deficit	(144,355)	(154,982)
Accumulated other comprehensive loss	(24,949)	(26,299)
Less treasury stock, at cost; 2014 - 932,811 and 2013 - 921,721	(5,119)	(5,080)
Total stockholders’ equity	1,343,462	1,326,419
Total liabilities and stockholders’ equity	$ 2,250,281	$ 2,232,119