Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Expected tax expense (benefit)									$ (9,892)	$ (27,762)	$ (48,693)
Valuation allowance on operations									5,885	24,265	38,324
Impact of Tax Reform Act on valuation allowance									(1,692)	(25,564)	0
Change in tax rate									1,692	20,147	516
State income taxes									972	339	(3,033)
GILTI tax									634	0	0
Incentive stock options									757	1,297	97
Nondeductible expenses for tax purposes									829	796	386
Expiration of capital loss									0	0	641
Other, net									273	187	(215)
Income tax expense (benefit)	$ 611	$ 258	$ (249)	$ 1,288	$ (5,403)	$ 17	$ 1,135	$ 48	1,908	(4,203)	(10,732)
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Foreign currency translation loss									1,038	599	838
Net tax benefits and nondeductible expenses in foreign jurisdictions									$ 1,412	$ 1,493	$ 407