Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Inception to date costs incurred	$ 2,021	$ 2,785
Total expected to be incurred	2,021	2,785
Summary of activity for liabilities [Roll Forward]
Beginning balance	0	0
Expenses incurred	1,840
Amount paid	0
Other adjustments	0
Ending balance	1,840
Restructuring expenses	1,840
EPDU Restructuring Plan [Member]
Summary of activity for liabilities [Roll Forward]
Expenses incurred		2,800
Restructuring expenses		2,800
Termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Inception to date costs incurred	1,840	1,904
Total expected to be incurred	1,840	1,904
Summary of activity for liabilities [Roll Forward]
Beginning balance	0	0
Expenses incurred	1,840
Amount paid	0
Other adjustments	0
Ending balance	1,840
Restructuring expenses	1,840
Contract termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Inception to date costs incurred	0	500
Total expected to be incurred	0	500
Summary of activity for liabilities [Roll Forward]
Beginning balance	0	0
Expenses incurred	0
Amount paid	0
Other adjustments	0
Ending balance	0
Restructuring expenses	0
Other costs [Member]
Restructuring Cost and Reserve [Line Items]
Inception to date costs incurred	181	381
Total expected to be incurred	181	381
Biosciences [Member]
Summary of activity for liabilities [Roll Forward]
Expenses incurred	2,000
Restructuring expenses	$ 2,000