Segment and Geographic Information - Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
TOTAL ASSETS	$ 760,013		$ 701,442
Corporate assets:
Cash and cash equivalents	51,802		53,119
Income taxes receivable	7,820		4,084
Prepaid expenses and other current assets	23,476		24,237
Net property and equipment	31,425
Net property and equipment			34,303
Operating lease right-of-use asset, net	102,354	$ 122,300
Capitalized software costs, net	66,445		72,210
Deferred income tax assets	17,971		22,146
Other noncurrent assets	70,884		70,022
Operating segments
Segment Reporting, Asset Reconciling Item [Line Items]
TOTAL ASSETS	387,836		421,321	$ 476,980
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
TOTAL ASSETS	372,177		280,121
Corporate assets:
Cash and cash equivalents	51,802		53,119
Income taxes receivable	7,820		4,084
Prepaid expenses and other current assets	23,476		24,237
Net property and equipment	31,425
Net property and equipment			34,303
Operating lease right-of-use asset, net	102,354
Capitalized software costs, net	66,445		72,210
Deferred income tax assets	17,971		22,146
Other noncurrent assets	$ 70,884		$ 70,022