Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 172,101	$ 170,457
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	1,241	18,663
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(550)	(364)
Adjustments:
Amortization	30,777	38,693
Accretion	3,318	2,240
Deferred income taxes	454	2,584
Fair value adjustments, net	(4,987)	1,200
Stock-based compensation	2,786	3,307
Gain on sale of the Joaquin project	0	(21,138)
Foreign exchange and other	401	(1,895)
Changes in operating assets and liabilities:
Receivables	(1,691)	5,680
Prepaid expenses and other current assets	(5,635)	(4,906)
Inventories	(8,708)	15,171
Accounts payable and accrued liabilities	(1,865)	(15,299)
CASH PROVIDED BY OPERATING ACTIVITIES	15,541	43,936
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(2,690)	11,335
Net Cash Provided by (Used in) Operating Activities	12,851	55,271
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(42,345)	(23,591)
Proceeds from the sale of assets	60	15,019
Purchase of short term investments and equity securities	(361)	(1,016)
Sales and maturities of short-term investments	1,619	10,020
Other	(65)	(14)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(41,092)	418
Cash Provided by (Used in) Investing Activities, Discontinued Operations	(28,470)	(388)
CASH USED IN INVESTING ACTIVITIES	(69,562)	30
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Unsecured Debt	15,000	0
Payments on long-term debt, capital leases, and associated costs	(18,449)	(3,206)
Other	(4,606)	(3,247)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(8,055)	(6,453)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	(22)	(20)
Net Cash Provided by (Used in) Financing Activities	(8,077)	(6,473)
Effect of exchange rate changes on cash and cash equivalents	557	555
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(64,231)	49,383
Cash and cash equivalents at end of period	159,643	160,636
Net Cash Provided by (Used in) Discontinued Operations	(32,930)	5,527
CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingNetCashProvidedByUsedInDiscontinuedOperationsAssetsHeldForSale	(31,301)	43,856
Net subsidiary payments to parent company	$ 1,748	$ 5,400

Amount of increase (decrease) in cash and cash equivalents including increase (decrease) due to assets held for sale.

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Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.

+ References

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- Definition

The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 9
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-Paragraph 8
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Amount of cash (inflow) outflow from investing activities classified as other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 13
-Subparagraph (c)
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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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- Definition

Amount of cash inflow (outflow) from financing activities classified as other.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section 45
-Paragraph 12
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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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-SubTopic 10
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-Paragraph 15
-Subparagraph (a),(b)
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- References

No definition available.

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