General and Summary of Significant Accounting Policies Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Cost	$ 45,699	$ 26,672
Accumulated Amortization	21,763	19,609
Net	23,936	7,063
Amortization [Abstract]
Amortization of Intangible Assets	$ 2,200	$ 2,400	$ 2,500
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	10 years	9 years
Cost	$ 13,308	$ 12,357
Accumulated Amortization	8,302	7,315
Net	$ 5,006	$ 5,042
MCDA contract [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	10 years	10 years
Cost	$ 8,571	$ 8,571
Accumulated Amortization	8,571	8,285
Net	$ 0	$ 286
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	9 years	9 years
Cost	$ 5,319	$ 5,319
Accumulated Amortization	4,133	3,584
Net	$ 1,186	$ 1,735
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	15 years
Cost	$ 7,080
Accumulated Amortization	118
Net	$ 6,962
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	4 years	4 years
Cost	$ 425	$ 425
Accumulated Amortization	425	425
Net	$ 0	$ 0
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	15 years
Cost	$ 7,310
Accumulated Amortization	122
Net	$ 7,188
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Life in Years	10 years
Cost	$ 3,686
Accumulated Amortization	92
Net	$ 3,594
Scenario, Forecast [Member]
Amortization [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months								$ 2,700
Future Amortization Expense, Year Two							$ 2,500
Future Amortization Expense, Year Three						$ 2,400
Future Amortization Expense, Year Four					$ 2,000
Future Amortization Expense, Year Five				$ 1,900