Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	2016			2015			2014
Current:
Domestic	$	(10,702	)	$	3,892		$	7,761
Foreign		(13,713	)		(5,376	)		(619	)
Total current income tax (provision) benefit		(24,415	)		(1,484	)		7,142
Deferred:
Domestic		7,480			(75,456	)		(1,572	)
Foreign		(10,493	)		20,630			(330	)
Total deferred income tax (provision) benefit		(3,013	)		(54,826	)		(1,902	)
Total income tax benefit (provision)	$	(27,428	)	$	(56,310	)	$	5,240

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

	2016		2015			2014
Domestic	$	41,014	$	(65,895	)	$	(1,505	)
Foreign		55,961		35,237			14,089
Total	$	96,975	$	(30,658	)	$	12,584

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

	2016					2015					2014
Computed “statutory” benefit (provision)	$	(33,941	)	35	%	$	10,731		35	%	$	(4,405	)	35	%
Percentage depletion		8,114		(8	)		2,432		8			6,034		(48	)
Change in valuation allowance		11,336		(12	)		(84,951	)	(277	)		(6,314	)	50
State taxes, net of federal taxes		(565	)	1			(3,639	)	(12	)		1,671		(13	)
Foreign currency remeasurement of monetary assets and liabilities		(4,598	)	5			28,184		92			16,368		(130	)
Rate differential on foreign earnings		(6,853	)	7			(4,746	)	(15	)		(5,938	)	47
Compensation		(1,311	)	1			(815	)	(3	)		(1,308	)	10
Other		390		(1	)		(3,506	)	(12	)		(868	)	7
Total	$	(27,428	)	28	%	$	(56,310	)	(184	)%	$	5,240		(42	)%

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

	December 31,
	2016			2015
Deferred tax assets:
Accrued reclamation costs	$	30,188		$	26,473
Deferred exploration		26,785			29,120
Foreign net operating losses		1,058			21,140
Domestic net operating losses		82,359			82,116
AMT credit carryforwards		20,405			11,607
Pension and benefit obligation		18,115			18,916
Foreign exchange loss		34,977			38,779
Foreign tax credit carryforward		7,283			6,692
Miscellaneous		30,166			27,205
Total deferred tax assets		251,336			262,048
Valuation allowance		(99,602	)		(115,806	)
Total deferred tax assets		151,734			146,242
Deferred tax liabilities:
Miscellaneous		(3,046	)		(2,394	)
Properties, plants and equipment		(235,700	)		(209,577	)
Total deferred tax liabilities		(238,746	)		(211,971	)
Net deferred tax liability	$	(87,012	)	$	(65,729	)

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

	2016			2015			2014
Balance at beginning of year	$	(115,806	)	$	(32,094	)	$	(27,155	)
Increase related to non-utilization of net operating loss carryforwards and non-recognition of deferred tax assets due to uncertainty of recovery		(2,868	)		(92,393	)		(6,314	)
Decrease related to utilization and expiration of deferred tax assets, other		19,072			8,681			1,375
Balance at end of year	$	(99,602	)	$	(115,806	)	$	(32,094	)