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Assets Held for Sale (Details) $ in Thousands	1 Months Ended					3 Months Ended				6 Months Ended
Assets Held for Sale (Details) $ in Thousands	Nov. 30, 2016 JPY (¥)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 JPY (¥)	Oct. 31, 2016 USD ($)	Feb. 28, 2016 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Long Lived Assets Held-for-sale [Line Items]
Gains on asset sales						$ 0			$ 0	$ 0	$ 5,242
Assets held for sale						0				0		$ 0
Liabilities held for sale						$ 0				$ 0		$ 0
San Jose Land Parcel [Member] \| Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Long Lived Assets Held-for-sale [Line Items]
Gains on asset sales					$ 5,200
Bit-isle [Member] \| Solar Power Assets [Member]
Long Lived Assets Held-for-sale [Line Items]
Proceeds from sale of property, plant and equipment	¥ 2,500,000,000	$ 22,100	¥ 400,000,000	$ 3,800			¥ 5,313,400,000	$ 47,800