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Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents
Total	$ 243,722	$ 269,232	$ 303,123	$ 270,811
Short-Term Investments
Total	104,979	116,050
Other
Assets held for sale	4,983	5,000
Transfer of assets between levels	0
Assets measured on a recurring basis
Cash and Cash Equivalents
Total	1,199	17,996
Short-Term Investments
Total	104,979	116,050
Other
Assets held for sale	4,983	5,000
Total	4,983	5,000
Assets measured on a recurring basis \| U.S. treasuries
Cash and Cash Equivalents
Total		9,999
Short-Term Investments
Total	92,765	94,918
Assets measured on a recurring basis \| Government agency securities
Cash and Cash Equivalents
Total		4,998
Short-Term Investments
Total	9,999	12,988
Assets measured on a recurring basis \| Corporate debt
Short-Term Investments
Total	2,215	8,144
Assets measured on a recurring basis \| Commercial paper
Cash and Cash Equivalents
Total	1,199	2,999
Assets measured on a recurring basis \| Level 1
Cash and Cash Equivalents
Total		9,999
Short-Term Investments
Total	92,765	94,918
Assets measured on a recurring basis \| Level 1 \| U.S. treasuries
Cash and Cash Equivalents
Total		9,999
Short-Term Investments
Total	92,765	94,918
Assets measured on a recurring basis \| Level 2
Cash and Cash Equivalents
Total	1,199	7,997
Short-Term Investments
Total	12,214	21,132
Other
Assets held for sale	4,983	5,000
Total	4,983	5,000
Assets measured on a recurring basis \| Level 2 \| Government agency securities
Cash and Cash Equivalents
Total		4,998
Short-Term Investments
Total	9,999	12,988
Assets measured on a recurring basis \| Level 2 \| Corporate debt
Short-Term Investments
Total	2,215	8,144
Assets measured on a recurring basis \| Level 2 \| Commercial paper
Cash and Cash Equivalents
Total	$ 1,199	$ 2,999