Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes
Income tax expense	$ 661	$ 4,738	$ 3,120	$ 9,458
Actual effective tax rate	(1.40%)	(12.80%)	(5.40%)	(14.70%)
Statutory tax rate			21.00%	21.00%
Increase (decrease) in valuation allowance			$ 18,300

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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