Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 201,245	$ 194,426
Accumulated depreciation and amortization	114,364	99,177
Property and equipment, net	86,881	95,249
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,244	9,244
Building and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 54,496	54,408
Building and building improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Building and building improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	39 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,473	1,437
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,240	2,248
Useful Life	5 years
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 25,618	22,736
Useful Life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,391	8,022
Useful Life	7 years
Other capital assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 128	128
Useful Life	5 years
Software development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 87,058	84,178
Useful Life	5 years
Program development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,597	$ 12,025
Useful Life	3 years
Program development | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	3 years