Unaudited Quarterly Financial Data (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information
Restructuring and reorganization charges	$ 1,000	$ 800	$ 2,500	$ 1,000	$ 1,600	$ 1,300	$ 1,800		$ 5,328	$ 4,834	$ 8,661
Impact of restructuring and reorganization charges on EPS	$ 0.02	$ 0.02	$ 0.06	$ 0.02	$ 0.04	$ 0.03	$ 0.04
Transaction related cost	$ 11,200	$ 1,800							11,200
Impact of transaction related cost on EPS	$ 0.23	$ 0.03
Write-off deferred contract costs of project implementation			$ 10,000
Effective income tax rate	33.00%	40.00%	27.00%	25.00%	7.00%	25.00%	28.00%	26.00%
Income tax benefit	$ (6,423)	$ (9,176)	$ (3,884)	$ (7,162)	$ (1,633)	$ (7,262)	$ (7,458)	$ (6,600)	$ (26,645)	$ (22,953)	$ (20,857)
Comcast
Quarterly Financial Information
Income tax benefit					$ 4,000
Stock warrants exercised					400,000					400,000