Share-based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based compensation
Non-cash share based compensation	$ 2,974	$ 4,588	$ 6,620	$ 7,745
Cost of sales
Share-based compensation
Non-cash share based compensation	474	595	995	1,065
Research and development
Share-based compensation
Non-cash share based compensation	613	982	1,486	1,775
Selling, general and administrative
Share-based compensation
Non-cash share based compensation	$ 1,887	$ 3,011	$ 4,139	$ 4,905
Restricted stock awards | Minimum
Share-based compensation
Expiration term			1 year
Restricted stock awards | Maximum
Share-based compensation
Expiration term			5 years
Stock options
Number of Shares
Outstanding at the beginning of the period (in shares)			1,119
Expired or forfeited (in shares)			(324)
Outstanding at the end of the period (in shares)	795		795
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)			$ 34.88
Expired or forfeited (in dollars per share)			33.96
Outstanding at the end of the period (in dollars per share)	$ 35.25		$ 35.25
Non-vested restricted shares and performance shares
Number of Shares
Outstanding at the beginning of the period (in shares)			2,257
Granted (in shares)			983
Performance award adjustments (in shares)			(45)
Vested (in shares)			(572)
Forfeited (in shares)			(348)
Outstanding at the end of the period (in shares)	2,275		2,275
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)			$ 16.20
Granted (in dollars per share)			9.32
Performance award adjustments (in dollars per share)			31.34
Vested (in dollars per share)			15.95
Forfeited (in dollars per share)			15.47
Outstanding at the end of the period (in dollars per share)	$ 13.10		$ 13.10