Long-term Supply Contract (Details) - USD ($) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 01, 2014 |
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| Commitments and Contingencies Disclosure [Abstract] | ||||
| Supply agreement liability | $ 0 | $ 22,250 | $ 27,300 | |
| Gain on contract termination | $ 20,612 | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Long-term Supply Commitment, Amount No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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