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Discontinued Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Income from discontinued operations, net of tax $ (573) $ (1,036) $ 50,630 $ 243 $ 0 $ 49,264
Basic and diluted (in USD per share)         $ 0.00 $ 2.82
Basic and diluted (in shares)         17,669 17,459
Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Service sales         $ 0 $ 5,769
Costs of service sales         0 1,807
Sales, marketing and support         0 1,606
General and administrative         0 1,619
Other expense, net         0 (23)
Income from discontinued operations before tax expense         0 714
Gain on sale of discontinued operations before tax expense         0 53,711
Total income from discontinued operations before tax expense         0 54,425
Income tax expense on discontinued operations         0 5,161
Income from discontinued operations, net of tax         $ 0 $ 49,264
Basic and diluted (in USD per share)         $ 0 $ 2.82
Basic and diluted (in shares)         17,669 17,459
Cash used in operating activities—discontinued operations         $ 0 $ (2,638)
Cash provided by investing activities—discontinued operations         $ 0 $ 87,986