Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Additions for tax positions related to current year	$ 0	$ 59
Effective income tax rate	(3.42%)		(0.15%)
Income Tax Benefit (Expense) Discrete Items	$ 0		$ 4,200
Income tax expense	1,004	$ 2,222	(80)	$ 4,348
Income Tax Expense (Benefit), before discrete items	$ (1,000)		$ (4,080)
Effective Income Tax Rate Reconciliation, Excluding Discrete Items, Percent	(3.42%)		(7.65%)
Unrecognized Tax Benefits	$ 9,300		$ 9,300
Unrecognized tax benefits, period increase (decrease)			$ 0	$ (59)
Minimum [Member] | Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective income tax rate					7.00%
Maximum [Member] | Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective income tax rate					8.00%