Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, Transitional tax liability and income tax expense		$ 6,900
Repatriation of foreign earnings		7,000
Tax Cuts and Jobs Act of 2017, foreign tax credits	$ 5,500	5,500
Tax Cuts and Jobs Act of 2017, deferred income tax (benefit)		(17,400)
Tax Cuts and Jobs Act of 2017, net tax benefit recognized	(3,400)
Effective income tax rate, deduction, worthless stock			$ 9,300
Income tax charge increase in valuation allowance for deferred tax assets			4,500	$ 4,600
Income tax benefit, forgiveness of certain inter-company balances, Brazilian subsidiary				4,400
Income tax benefit, release of U.S. tax reserves				$ 2,200
Deferred tax assets, NOL carryforwards, state and local	245,900	245,900
Deferred tax assets, NOL carryforwards, foreign	30,500	30,500
Deferred tax assets, valuation allowance	30,154	30,154	21,847
Income Tax Examination [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 300	300	$ 2,200
Tax Year 2014 and 2015 [Member] | Domestic tax authority [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 3,900