Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Income Taxes
Income tax (expense) benefit	$ (4,720)	$ (4,025)
Actual effective tax rate	(18.70%)	(20.20%)
Statutory tax rate	21.00%	21.00%
Increase (decrease) in valuation allowance	$ 6,300

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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