Long-Term Obligations and Commitments, Research and Development Facility Lease Obligation (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2010 USD ($)	Dec. 31, 2015 USD ($) Option	Dec. 31, 2014 USD ($)
Research and Development Facility Lease Obligation [Abstract]
Net book value of facility and associated parcel of land		$ 90,233	$ 88,958
Accumulated depreciation of facility		$ 72,706	66,053
Purchase price of land	$ 10,100
Primary Research and Development Facility [Member]
Research and Development Facility Lease Obligation [Abstract]
Number of options to extend lease | Option		4
Term of lease extension		5 years
Net book value of facility and associated parcel of land		$ 62,200	64,400
Accumulated depreciation of facility		9,900	$ 7,700
Annual Future Rent Payments [Abstract]
2016		6,550
2017		6,550
2018		6,943
2019		6,943
2020		7,359
Thereafter		91,205
Total minimum payments		$ 125,550