Acquisitions and Disposals - Schedule of Asset Disposal (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Business Combinations [Abstract]
Total Consideration Received	$ 4,916
Carrying value of Roca Honda project	(648)
Gain on disposal of Roca Honda project	$ 4,268

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration