Commitments, Contingencies and Other Items (Details) plaintiff in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) plaintiff patent
Loss Contingencies [Line Items]
Estimate of possible loss	$ 19,000,000
Loss Contingency, Patents Allegedly Infringed, Number | patent	1
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Estimate of possible loss	$ 300,000
Minnesota Consumer Class Actions | U.S. District Court for the District of Minnesota
Loss Contingencies [Line Items]
Loss Contingency, Number Of Plaintiffs Elected To Opt Out | plaintiff	12
Number of potential class members | plaintiff	11
Minnesota Securities Investor Class Actions | U.S. District Court for the District of Minnesota
Loss Contingencies [Line Items]
Amount awarded to other party	$ 55,000,000