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Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Examination [Line Items]
Provision (benefit) for income taxes	$ (1,212,000)	$ (2,214,000)	$ 1,700,000	$ 1,179,000	$ 29,535,000	$ (3,524,000)	$ (10,096,000)	$ (6,943,000)	$ 75,000	$ 1,113,000	$ 694,000	$ 3,559,000	$ (547,000)	$ 8,972,000	$ 5,441,000
Effective Income Tax Rate, Continuing Operations													1.40%	(1.40%)	31.30%
Difference between effective tax rate and federal statutory rate													33.60%	36.40%	3.70%
Valuation allowance	109,913,000				107,312,000				$ 0				$ 109,913,000	$ 107,312,000	$ 0
Deferred income tax assets	29,398,000				16,796,000								29,398,000	16,796,000
Net operating loss carryforwards	148,199,000				85,609,000								148,199,000	85,609,000
Loss carryforwards for U.S. federal income tax purposes	50,587,000				33,606,000								50,587,000	33,606,000
Loss carryforwards for U.S. state income tax purposes	78,274,000				34,492,000								78,274,000	34,492,000
Loss carryforwards for foreign income tax purposes	19,338,000				17,511,000								19,338,000	17,511,000
Decrease in valuation allowance													17,849,000
Unremitted earnings of foreign subsidiaries	38,545,000												38,545,000
Unrecognized benefits													10,077,000	6,451,000
Anticipated additional unrecognized tax benefits during the next twelve months													$ 0
Australia Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2012
Belgium Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2013
Brazil Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
China Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2013
France Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2013
German Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2012
India Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2013
Israel Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2012
Italy Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
Japan Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
Korea Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
Mexican Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
Netherlands Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
Switzerland Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
United Kingdom Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2015
Uruguay Tax Authority [Member]
Income Tax Examination [Line Items]
Tax years subject to examination													2011
U.S Federal Income Tax [Member]
Income Tax Examination [Line Items]
Research and experimentation tax credit carryforwards	2,544,000				2,544,000								$ 2,544,000	2,544,000
Foreign tax credits	7,155,000				2,740,000								7,155,000	2,740,000
Other tax credits	474,000				474,000								$ 474,000	474,000
U.S Federal Income Tax [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards beginning expiration date													Dec. 31, 2022
U.S. State Income Tax [Member]
Income Tax Examination [Line Items]
Research and experimentation tax credit carryforwards	2,649,000				2,082,000								$ 2,649,000	2,082,000
Other tax credits	600,000				615,000								$ 600,000	615,000
U.S. State Income Tax [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards beginning expiration date													Dec. 31, 2017
Foreign Income Tax [Member]
Income Tax Examination [Line Items]
Research and experimentation tax credit carryforwards	$ 149,000				$ 155,000								$ 149,000	$ 155,000
Foreign Income Tax [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Net operating loss carryforwards beginning expiration date													Dec. 31, 2018

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