Capitalized Software (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Capitalized Software
Capitalized software costs	$ 82,877	$ 80,732
Less: accumulated amortization	44,271	41,353
Total	38,606	39,379
Reduction in capitalized software costs and related accumulated amortization for fully amortized costs that are no longer in use	21,800
Capitalized software costs not subject to amortization	0	100
Amortization of capitalized software costs	$ 25,100	$ 24,600	$ 25,800