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Commitments and Contingencies Schedule of Future Commitments (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Other Commitment, Fiscal Year Maturity [Abstract]  
Remainder of 2017 $ 264
2018 549
2019 560
2020 341
2021 270
Thereafter 0
Total 1,984
Remainder of 2017 109
2018 1,446
2019 1,897
2020 1,897
2021 1,897
Thereafter 56,372
Total 63,618
Remainder of 2017 17,533
2018 33,031
2019 28,274
2020 26,250
2021 26,173
Thereafter 609,253
Total 740,514
Transmission Service Agreement [Member]  
Other Commitment, Fiscal Year Maturity [Abstract]  
Remainder of 2017 13,445
2018 23,600
2019 23,600
2020 23,600
2021 23,600
Thereafter 543,246
Total 651,091
Payments in lieu taxes [Member]  
Other Commitment, Fiscal Year Maturity [Abstract]  
Remainder of 2017 241
2018 481
2019 476
2020 412
2021 406
Thereafter 9,635
Total 11,651
Service and Maintenance Agreements [Member]  
Other Commitment, Fiscal Year Maturity [Abstract]  
Remainder of 2017 3,474
2018 6,955
2019 1,741
2020 0
2021 0
Thereafter 0
Total $ 12,170