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Summary of Significant Accounting Policies - Energy Assets (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Interest costs capitalized | $ 3,817,000 | $ 4,256,000 | $ 1,253,000
Deferred grant income | 6,637,000 | 7,188,000 |
Rebates from utility company | $ 0 | $ 0 | $ 0

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