The unamortized amount of current and long-term liabilities that an Entity assumes in consideration for the estimated fair value of the Entity's share of buildings in the build out of leased facilities plus any tenant improvement allowance received from landlords. As the Entity retains sufficient continuing involvement following the completion of construction, for accounting purposes, the Entity is treated as the owner of the leased facilities and to record an imputed financing obligation for its obligation to the legal owners.

No definition available.

Commitments and Contingencies (Details) $ in Thousands					3 Months Ended		12 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Aug. 16, 2013 USD ($)	Feb. 01, 2012	Dec. 15, 2009 USD ($) ft²	Jun. 29, 2009 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2011	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jan. 31, 2013 ft²	Sep. 29, 2012 USD ($)	Nov. 04, 2011 USD ($) ft²	Sep. 29, 2011 ft²	Mar. 08, 2010 ft²	Jul. 10, 2009 USD ($)
Lease Commitments
Interest expense related to imputed financing obligation							$ 4,500	$ 4,500	$ 4,400
Current and Long Term, Imputed Financing Obligation					$ 39,300		39,300	39,500
Capitalized property plant and equipment					40,320		40,320	40,320
Restructuring charges					3,600		3,576	39	5,546
Convertible notes \| 5% Convertible Senior Notes due 2014
Lease Commitments
Face Value				$ 150,000											$ 22,500
Debt discount amortization period				5 years
Convertible notes \| 1.125% Convertible Senior Notes due 2018
Lease Commitments
Face Value	$ 138,000				138,000		138,000	138,000
Unamortized discount					$ 17,099		$ 17,099	22,911
Debt discount amortization period	5 years						32 months
Convertible Senior Notes [Member] \| 5% Convertible Senior Notes due 2014
Lease Commitments
Repayments of Debt								$ 172,500
Facility Closing [Member]
Lease Commitments
Restructuring charges									$ 2,000
Sunnyvale Facility, Original agreement
Lease Commitments
Number of options			2
Period for extension of lease (in months)			60 months
Operating Lease Commitment Termination Period			84 months
Total reimbursement receivable under lease agreement			$ 9,100
Total space under lease (in square feet) \| ft²			125,000
Sunnyvale Facility, First Amended
Lease Commitments
Total reimbursement receivable under lease agreement												$ 1,700
Total space under lease (in square feet) \| ft²										31,000		31,000
Sunnyvale Facility, Second Amended
Lease Commitments
Total reimbursement receivable under lease agreement											$ 1,500
Ohio Facility
Lease Commitments
Period for extension of lease (in months)						60 months
Total space under lease (in square feet) \| ft²													51,000
Fogg-Brecksville Development Co., Original
Lease Commitments
Total space under lease (in square feet) \| ft²														25,000
San Francisco Facility
Lease Commitments
Lease term (in months)		75 months
Total space under lease (in square feet) \| ft²												26,000