Additional Cash Flow Information (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Supplemental Cash Flow Information [Abstract] | ||
| Capital Expenditures Incurred but Not yet Paid | $ 901 | $ 217 |
| Other non-current assets 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 Other Capital Expenditures Incurred but Not yet Paid 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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