Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 51
-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757

Name:	us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

LONG-TERM DEBT - Sale-Leaseback (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 29, 2016	Oct. 29, 2015	Dec. 31, 2016	Dec. 31, 2015
Sale-leaseback transaction
Proceeds from sale of mining equipment leased back			$ 33,881	$ 100,000
Sale-leaseback of mining equipment, October 2015
Sale-leaseback transaction
Proceeds from sale of mining equipment leased back		$ 100,000
Sale-leaseback of mining equipment, June 2016
Sale-leaseback transaction
Proceeds from sale of mining equipment leased back	$ 33,900