Property, Equipment and Software (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balances of major classes of assets and accumulated depreciation and amortization
Property, equipment and software at cost	$ 55,824	$ 51,298
Accumulated depreciation and amortization	33,284	30,442
Property, equipment and software, net	22,540	20,856
Software
Balances of major classes of assets and accumulated depreciation and amortization
Property, equipment and software at cost	42,348	36,863
Computer and other equipment
Balances of major classes of assets and accumulated depreciation and amortization
Property, equipment and software at cost	9,874	8,255
Sublease asset
Balances of major classes of assets and accumulated depreciation and amortization
Property, equipment and software at cost		2,814
Leasehold improvements
Balances of major classes of assets and accumulated depreciation and amortization
Property, equipment and software at cost	1,753	1,698
Furniture and fixtures
Balances of major classes of assets and accumulated depreciation and amortization
Property, equipment and software at cost	$ 1,849	$ 1,668