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Tax Matters - Current Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current tax assets
Income tax receivable	$ 27,404	$ 17,158
Current tax liabilities
Income tax payable	2,335	7,419
Net tax assets	$ 25,069	$ 9,739

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The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods net of the amount of current tax for current and prior periods to the extent unpaid. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of current tax for current and prior periods to the extent unpaid. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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