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Commitments and Contingencies (Details) $ in Thousands				3 Months Ended	12 Months Ended
	Nov. 17, 2017 USD ($)	Aug. 16, 2013 USD ($)	Dec. 15, 2009 USD ($) ft²	Sep. 30, 2011	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	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
Lease Commitments
Interest expense related to imputed financing obligation					$ 4,300	$ 4,400	$ 4,400
Current and Long Term, Imputed Financing Obligation					37,600	38,300
Capitalized property plant and equipment					40,320	40,320
Restructuring charges					2,217	0	$ 0
Convertible notes | 1.125% Convertible Senior Notes due 2018
Lease Commitments
Face Value		$ 138,000			0	81,207
Unamortized discount					0	2,547
Unamortized Debt Issuance Expense					0	209
Debt discount amortization period		5 years
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member]
Lease Commitments
Face Value	$ 172,500				172,500	172,500
Unamortized discount					28,517	34,506
Unamortized Debt Issuance Expense					$ 2,049	$ 2,547
Debt discount amortization period	5 years				4 years 1 month 2 days
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

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- Definition

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.

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Represents the total capitalized amount of property, plant and equipment which was based on the estimated fair value of the portion of the unfinished leased building along with a corresponding financing obligation for the same amount.

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Area of a real estate property.

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