Capitalized Software (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capitalized Software
Capitalized software costs	$ 85,398	$ 86,316
Less: accumulated amortization	42,536	45,057
Total	42,862	41,259
Capitalization of software development costs	27,587	27,782	$ 24,617
Reduction in capitalized software costs and related accumulated amortization for fully amortized costs that are no longer in use	28,300
Amortization of capitalized software costs	25,400	25,600	$ 25,100
Capitalized software costs not subject to amortization	$ 0	$ 0