Income Taxes (Narrative) (Details) In Thousands, unless otherwise specified	12 Months Ended				3 Months Ended	0 Months Ended		1 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 State [Member] USD ($)	Sep. 29, 2012 Foreign Tax Authority [Member] Belgium EUR (€)	Dec. 28, 2012 Foreign Tax Authority [Member] Belgium 2005 Assessment [Member] EUR (€)	Dec. 28, 2012 Foreign Tax Authority [Member] Belgium 2009 Assessment [Member] EUR (€)	Dec. 31, 2013 Foreign Tax Authority [Member] Belgium 2006 Assessment [Member] EUR (€)	Dec. 31, 2013 Foreign Tax Authority [Member] Belgium 2007 Assessment [Member] EUR (€)	Dec. 31, 2013 Foreign Tax Authority [Member] Belgium 2010 Assessment [Member] EUR (€)	Jan. 31, 2012 Foreign Tax Authority [Member] Belgium 2008 Assessment [Member] EUR (€)	Jun. 28, 2014 Foreign Tax Authority [Member] Belgium 2008 Assessment [Member] EUR (€)	Dec. 31, 2014 Foreign Subsidiary and State Net Operating Losses and Tax Credits [Member] USD ($)	Dec. 31, 2013 Foreign Subsidiary and State Net Operating Losses and Tax Credits [Member] USD ($)	Dec. 31, 2014 Disposal Of A Subsidiary [Member] USD ($)	Dec. 31, 2014 State Deferred Tax Assets [Member] USD ($)	Dec. 31, 2014 Operating Loss Carryforward, Foreign Jurisdiction [Member] USD ($)
Income Taxes [Line Items]
Valuation allowance against deferred tax asset	$ 300,472	$ 375,859
Change in the valuation allowance	(39,243)	54,274											(75,387)	12,471	(61,148)	51,987	189,883
Net operating loss carryforwards and tax credit	432,906	438,272		65,041
Net operating loss carryforwards in various foreign jurisdictions	367,864
Federal income taxes on earnings	1,385,000
Foreign Tax Assessment						46,135	35,567	38,817	39,635	43,117	23,789	30,131
Interest Tax Examination, Refund, Interest Income					1,583
Gross unrecognized tax benefits	49,599	56,545	53,835
Unrecognized tax benefits that would impact effective tax rate	22,490
Interest and penalties	9,409	13,890
Accrued/(reversed) interest and penalties	(3,579)	74	(1,585)
Expected decrease in unrecognized tax benefits within next twelve months	$ 14,746