Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

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-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4D

-Subparagraph (c)(2)

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

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-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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-Name Accounting Standards Codification

-Topic 320

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Fair value of financial and nonfinancial obligations.

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The aggregate value of all restricted investments.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

-Subparagraph (SX 210.12-12C.9(c))

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-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.6(c))

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Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Total assets	$ 6,664us-gaap_AssetsFairValueDisclosure	$ 9,864us-gaap_AssetsFairValueDisclosure
Liabilities:
Total liabilities	36,301us-gaap_LiabilitiesFairValueDisclosure	39,126us-gaap_LiabilitiesFairValueDisclosure
Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		21,912
Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		15,370
Other Derivative Instrument [Member]
Assets:
Fair value of derivative asset	110
Liabilities:
Derivative fair value of derivative liability		805
Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	2,066
Liabilities:
Derivative fair value of derivative liability	529	1,039
Short-term Deposit [Member]
Assets:
Short-term deposits		5,982
Marketable securities [Member]
Assets:
Restricted certificates of deposits	4,488	3,882
Fair Value, Inputs, Level 1 [Member]
Assets:
Total assets	3,109	4,603
Liabilities:
Total liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 1 [Member] \| Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 1 [Member] \| Other Derivative Instrument [Member]
Assets:
Fair value of derivative asset	0
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 1 [Member] \| Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	0
Liabilities:
Derivative fair value of derivative liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Short-term Deposit [Member]
Assets:
Short-term deposits		4,603
Fair Value, Inputs, Level 1 [Member] \| Marketable securities [Member]
Assets:
Restricted certificates of deposits	3,109	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Total assets	2,176	3,882
Liabilities:
Total liabilities	529	1,844
Fair Value, Inputs, Level 2 [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 2 [Member] \| Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 2 [Member] \| Other Derivative Instrument [Member]
Assets:
Fair value of derivative asset	110
Liabilities:
Derivative fair value of derivative liability		805
Fair Value, Inputs, Level 2 [Member] \| Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	2,066
Liabilities:
Derivative fair value of derivative liability	529	1,039
Fair Value, Inputs, Level 2 [Member] \| Short-term Deposit [Member]
Assets:
Short-term deposits		0
Fair Value, Inputs, Level 2 [Member] \| Marketable securities [Member]
Assets:
Restricted certificates of deposits	0	3,882
Fair Value, Inputs, Level 3 [Member]
Assets:
Total assets	1,379	1,379
Liabilities:
Total liabilities	35,772	37,282
Fair Value, Inputs, Level 3 [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		21,912
Fair Value, Inputs, Level 3 [Member] \| Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		15,370
Fair Value, Inputs, Level 3 [Member] \| Other Derivative Instrument [Member]
Assets:
Fair value of derivative asset	0
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 3 [Member] \| Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	0
Liabilities:
Derivative fair value of derivative liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Short-term Deposit [Member]
Assets:
Short-term deposits		1,379
Fair Value, Inputs, Level 3 [Member] \| Marketable securities [Member]
Assets:
Restricted certificates of deposits	1,379	0
Palmarejo Royalty Obligation [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability	19,250
Palmarejo Royalty Obligation [Member] \| Fair Value, Inputs, Level 1 [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability	0
Palmarejo Royalty Obligation [Member] \| Fair Value, Inputs, Level 2 [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability	0
Palmarejo Royalty Obligation [Member] \| Fair Value, Inputs, Level 3 [Member] \| Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability	19,250
Rochester Royalty Obligation [Member] \| Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	16,522
Rochester Royalty Obligation [Member] \| Fair Value, Inputs, Level 1 [Member] \| Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	0
Rochester Royalty Obligation [Member] \| Fair Value, Inputs, Level 2 [Member] \| Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	0
Rochester Royalty Obligation [Member] \| Fair Value, Inputs, Level 3 [Member] \| Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	$ 16,522