Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Additions for tax positions related to current year	$ 0	$ 30
Effective income tax rate	(4.52%)
Income Tax Benefit (Expense) Discrete Items	$ 4,200
Income tax expense	(1,084)	2,126
Income Tax Expense (Benefit), before discrete items	$ (3,076)
Effective Income Tax Rate Reconciliation, Excluding Discrete Items, Percent	12.80%
Unrecognized Tax Benefits	$ 9,294
Unrecognized tax benefits, period increase (decrease)	$ 0	$ (30)
Minimum [Member] | Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective income tax rate			8.00%
Maximum [Member] | Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective income tax rate			9.00%