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Consolidated Majority-Owned Subsidiaries - Fair Value of Assets Acquired and Liabilities Assumed - AquaBounty (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 15, 2013
Business Acquisition [Line Items]
Goodwill	$ 101,059us-gaap_Goodwill	$ 13,823us-gaap_Goodwill	$ 0us-gaap_Goodwill
AquaBounty Technologies, Inc.
Business Acquisition [Line Items]
Cash				5,419
Short-term investments				14
Trade receivables				4
Other receivables				9
Prepaid expenses and other				200
Property, plant and equipment				1,241
Intangible assets				14,900
Other assets				22
Total assets acquired				21,809
Accounts payable				156
Accrued compensation				94
Other accrued liabilities				395
Long-term debt				1,354
Total liabilities assumed				1,999
Net assets acquired				19,810
Goodwill				13,001
Total consideration and fair value of noncontrolling interest				$ 32,811