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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Liability for unrecognized tax benefits	$ 6,628		$ 6,628
Unrecognized tax benefits, income tax penalties and interest accrued	965		965
Unrecognized tax benefits that would impact the effective tax rate	6,374		$ 6,374
Federal Statutory Income Tax Rate, Historical					35.00%
Tax Cuts and Jobs Act of 2017 Corporate Federal Tax Rate			21.00%
Income Tax Expense (Benefit)	$ 363	$ 238	$ 1,440	$ (346)
Effective Income Tax Rate Reconciliation, Percent	2.80%		8.20%
Other Tax Benefits	$ 3,295
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination			2015
Minimum
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination			2014
Maximum
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination			2016

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

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