Commitments and Contingencies Schedule of Future Commitments (Details)
$ in Thousands |
Sep. 30, 2017
USD ($)
|
| Other Commitment, Fiscal Year Maturity [Abstract] |
|
| Remainder of 2017 |
$ 270
|
| 2018 |
701
|
| 2019 |
714
|
| 2020 |
498
|
| 2021 |
430
|
| Thereafter |
3,536
|
| Total |
6,149
|
| Remainder of 2017 |
55
|
| 2018 |
1,504
|
| 2019 |
1,956
|
| 2020 |
1,957
|
| 2021 |
1,958
|
| Thereafter |
57,982
|
| Total |
65,412
|
| Remainder of 2017 |
9,897
|
| 2018 |
37,285
|
| 2019 |
32,612
|
| 2020 |
30,675
|
| 2021 |
30,686
|
| Thereafter |
614,764
|
| Total |
755,919
|
| Transmission Service Agreement [Member] |
|
| Other Commitment, Fiscal Year Maturity [Abstract] |
|
| Remainder of 2017 |
6,723
|
| 2018 |
23,600
|
| 2019 |
23,600
|
| 2020 |
23,600
|
| 2021 |
23,600
|
| Thereafter |
543,246
|
| Total |
644,369
|
| Payments in lieu taxes [Member] |
|
| Other Commitment, Fiscal Year Maturity [Abstract] |
|
| Remainder of 2017 |
121
|
| 2018 |
481
|
| 2019 |
476
|
| 2020 |
412
|
| 2021 |
406
|
| Thereafter |
9,635
|
| Total |
11,531
|
| Service and Maintenance Agreements [Member] |
|
| Other Commitment, Fiscal Year Maturity [Abstract] |
|
| Remainder of 2017 |
2,728
|
| 2018 |
10,999
|
| 2019 |
5,866
|
| 2020 |
4,208
|
| 2021 |
4,292
|
| Thereafter |
365
|
| Total |
$ 28,458
|