Note O - Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring expense	$ 5,219	$ 3,281	$ 6,585	$ 7,787	$ 11,800
Customer Dattbase Build Write-off [Member]
Restructuring expense		1,845		4,035
Contract Termination [Member]
Restructuring expense				2,100
Adjustment to Contract Termination Fee [Member]
Restructuring expense	(306)		(306)
Employee Severance [Member]
Restructuring expense	997	496	1,411	644
Lease Impairment and Termination Charges [Member]
Restructuring expense	2,626		2,974	68
Capital Losses from Asset Disposal [Member]
Restructuring expense	1,160	632	1,140	632
Facility Closing [Member]
Restructuring expense	742	308	1,366	308
Facility, Asset Impairment and Other Expense [Member]
Restructuring expense	$ 4,528	$ 940	$ 5,480	$ 1,008