Goodwill and Other Intangibles - Other Intangible (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 31, 2016
Other Intangible Assets
Gross Carrying Amount	$ 42,430	$ 55,814
Accumulated Amortization	27,040	31,203
Other intangible assets not subject to amortization	8,900
Amortization expense of other intangible assets	1,852	3,206	$ 4,300
Impairment of other intangible assets	0	0
Customer intangibles disposed		3,800		$ 6,700
Estimate of future amortization expense for acquired other intangibles
Total	15,390	24,611	$ 31,595
Trade name
Other Intangible Assets
Gross Carrying Amount	8,518	8,545
Trading rights
Other Intangible Assets
Gross Carrying Amount	339	339
Other
Other Intangible Assets
Gross Carrying Amount	50	50
Estimate of future amortization expense for acquired other intangibles
2017	1,230
2018	1,020
2019	894
2020	687
2021	606
Thereafter	2,046
Total	6,483
POSIT trade name
Other Intangible Assets
Other intangible assets not subject to amortization	8,400
Customer related intangibles
Other Intangible Assets
Gross Carrying Amount	10,358	23,322
Accumulated Amortization	$ 5,584	10,400
Useful Lives	16 years 10 months 24 days
Proprietary software
Other Intangible Assets
Gross Carrying Amount	$ 23,165	23,558
Accumulated Amortization	$ 21,456	$ 20,803
Useful Lives	9 years 1 month 6 days