Income Taxes (Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal rate	35.00%	35.00%	35.00%
State and local taxes, net of federal tax benefit	0.20%	0.60%	2.50%
Tax on foreign income	6.00%	(24.40%)	141.40%
Tax on uncertain tax positions	(3.60%)	34.10%	8.20%
Venezuela devaluation and highly inflationary accounting	0.00%	23.90%	168.10%
Reorganizations	0.00%	(93.60%)	(173.50%)
Effective Income Tax Rate Reconciliation, U.S. Tax Reform	(24.70%)	0.00%	0.00%
Net change in valuation allowances	62.40%	375.10%	3395.60%
Imputed royalties and associated non-deductible expenses	9.50%	50.30%	41.20%
Research credits	(1.30%)	(5.40%)	(8.90%)
Other	(0.10%)	3.80%	(0.80%)
Effective tax rate	83.40%	399.40%	3608.80%