Settlement with French Tax Authorities (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2016	Aug. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Tax Adjustments, Settlements, and Unusual Provisions		$ 6,900
Accrued Income Taxes, Current			$ 12,683		$ 12,683		$ 7,359
Income Tax Expense (Benefit)			10,740	$ 9,156	22,790	$ 18,754
Settlement with Taxing Authority [Member]
Accrued Income Taxes, Current			$ 1,900		$ 1,900
French Tax Authorities [Member]
Income Tax Expense (Benefit)	$ 1,100