Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and Contingent Liabilities (Narrative) (Details)

v3.8.0.1
Commitments and Contingent Liabilities (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]  
Lease Expire dates September 2020
Bottom of range [Member] | PV Plants [Member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease agreements (Years) 20 Years
Lease Expire dates 2031
Top of range [member] | PV Plants [Member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease agreements (Years) 25 Years
Lease Expire dates 2036