Additional Cash Flow Information (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Supplemental Cash Flow Information [Abstract] | ||
| Property, plant and equipment non-cash accruals | $ 2,584 | $ 0 |
| Non-cash settlement of withholding taxes associated with the 2017 bonus accrual | 5,583 | 0 |
| Non-cash settlement of the 2017 bonus accrual | $ 15,140 | $ 0 |
| X | ||||||||||
- Definition Noncash Settlement of Accrued Expense No definition available.
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| X | ||||||||||
- Definition Noncash Settlement of Accrued Expense, Taxes Withheld No definition available.
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| X | ||||||||||
- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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