Income Taxes (Components of deferred tax assets and liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carryforwards	$ 147,056	$ 120,639
Income tax credits	27,212	24,754
Property, plant and equipment	21,921	19,796
Accrued liabilities	62,016	76,682
Unrealized foreign exchange loss	869	4,947
Other	16,659	12,963
Total deferred tax assets	275,733	259,781
Valuation allowance	(168,105)	(149,847)
Total deferred tax assets net of valuation allowance	107,628	109,934
Property, plant and equipment	31,345	27,921
Deferred gain	3,716	5,036
Other	6,713	2,844
Total deferred tax liabilities	41,774	35,801
Net deferred tax assets	(65,854)	(74,133)
Other current assets	0	21,864
Other assets	70,784	54,950
Accrued expenses	0	(1,092)
Other non-current liabilities	(4,930)	(1,589)
Net deferred tax assets	65,854	74,133
Valuation Allowance, Deferred Tax Asset, Change in Amount	(18,300)	$ (29,300)	$ (30,600)
Valuation Allowance Share Based Compensation [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation allowance	$ (12,800)