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Summary of Significant Accounting Policies - Amounts Related to Sale Leaseback (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Sale Leaseback Transaction [Line Items] |  |  |
Capital lease assets, net | $ 6,985 | $ 5,303 |
Total deferred loss | 2,032 | 2,172 |
Total capital lease liabilites | 33,363 | 34,869 |
Total deferred gain | 6,153 | 6,173 |
Solar PV project |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Deferred loss, short-term, net | 115 | 118 |
Deferred loss, long-term, net | 1,917 | 2,054 |
Total deferred loss | 0 | 1,204 | $ 145
Capital lease liabilities, short-term | 4,956 | 4,157 |
Capital lease liabilities, long-term | 28,407 | 30,712 |
Deferred gain, short-term, net | 345 | 338 |
Deferred gain, long-term, net | 5,808 | 5,835 |
Total deferred gain | 574 | 4,625 | $ 906
Solar PV project | Assets Held under Capital Leases |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Capital lease assets, net | $ 38,263 | $ 36,676 |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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