Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2015			2014			2013
Current:
Domestic	$	3,892		$	7,761		$	2,963
Foreign		(5,376	)		(619	)		(175	)
Total current income tax (provision) benefit		(1,484	)		7,142			2,788
Deferred:
Domestic		(75,456	)		(1,572	)		247
Foreign		20,630			(330	)		6,760
Total deferred income tax (provision) benefit		(54,826	)		(1,902	)		7,007
Total income tax benefit (provision)	$	(56,310	)	$	5,240		$	9,795

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	2015			2014			2013
Domestic	$	(65,895	)	$	(1,505	)	$	(1,681	)
Foreign		35,237			14,089			(33,244	)
Total	$	(30,658	)	$	12,584		$	(34,925	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2015					2014					2013
Computed “statutory” benefit (provision)	$	10,731		35	%	$	(4,405	)	35	%	$	12,224		35	%
Percentage depletion		2,432		8			6,034		(48	)		3,946		11
Change in valuation allowance other than utilization		(84,951	)	(277	)		(6,314	)	50			(3,870	)	(11	)
State taxes, net of federal taxes		(3,639	)	(12	)		1,671		(13	)		720		2
Transaction costs		(270	)	(1	)		—		—			(1,743	)	(5	)
Foreign currency translation of monetary assets		28,184		92			16,368		(130	)		3,445		10
Rate differential on foreign earnings		(4,746	)	(15	)		(5,938	)	47			(4,255	)	(12	)
Compensation		(815	)	(3	)		(1,308	)	10			(326	)	(1	)
Other		(3,236	)	(11	)		(868	)	7			(346	)	(1	)
	$	(56,310	)	(184	)%	$	5,240		(42	)%	$	9,795		28	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2015			2014
Deferred tax assets:
Accrued reclamation costs	$	26,473		$	20,573
Deferred exploration		29,120			32,225
Foreign net operating losses		21,140			25,790
Domestic net operating losses		82,116			73,018
AMT credit carryforwards		11,607			14,698
Pension and benefit obligation		18,916			16,876
Foreign exchange gain		38,779			16,555
Miscellaneous		33,897			29,976
Total deferred tax assets		262,048			229,711
Valuation allowance		(115,806	)		(32,094	)
Total deferred tax assets		146,242			197,617
Deferred tax liabilities:
Miscellaneous		(2,394	)		(7,620	)
Properties, plants and equipment		(209,577	)		(232,397	)
Total deferred tax liabilities		(211,971	)		(240,017	)
Net deferred tax liability	$	(65,729	)	$	(42,400	)

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

	2015			2014			2013
Balance at beginning of year	$	(32,094	)	$	(27,155	)	$	(23,030	)
Increase related to non-utilization of net operating loss carryforwards and non-recognition of deferred tax assets due to uncertainty of recovery		(92,393	)		(6,314	)		(3,870	)
Decrease related to utilization and expiration of deferred tax assets, other		8,681			1,375			(255	)
Balance at end of year	$	(115,806	)	$	(32,094	)	$	(27,155	)