Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Deferred tax assets, valuation allowance	$ 21,847	$ 16,780
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. v tax reserves		2,200
Deferred tax assets, NOL carryforwards, state and local	240,500
Deferred tax assets, NOL carryforwards, foreign	26,400
Unremitted foreign earnings permanently reinvested abroad	161,700	142,800
Unrecognized tax benefits that would impact effective tax rate	500	2,200
Unrecognized tax benefits, income tax penalties and interest expense		100	$ 400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	100	$ 100
BRAZILIAN ENERGY EXCHANGE [Member]
Income Tax Contingency [Line Items]
Effective income tax rate benefit, worthless stock deduction	$ (9,300)