Goodwill and Other Intangibles - Other Intangible (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 22, 2015
Other Intangible Assets
Gross Carrying Amount	$ 55,814	$ 62,764
Accumulated Amortization	31,203	31,169
Other intangible assets not subject to amortization	8,900
Amortization expense of other intangible assets	3,200	4,300	$ 4,000
Impairment of other intangible assets	0
Customer intangibles disposed				$ 3,800
Trade name
Other Intangible Assets
Gross Carrying Amount	8,545	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
2016	2,557
2017	2,406
2018	2,197
2019	1,959
2020	1,767
Thereafter	4,791
Total	15,677
POSIT trade name
Other Intangible Assets
Other intangible assets not subject to amortization	8,400
Customer related intangibles
Other Intangible Assets
Gross Carrying Amount	23,322	30,272
Accumulated Amortization	$ 10,400	11,210
Useful Lives	14 years 3 months 18 days
Proprietary software
Other Intangible Assets
Gross Carrying Amount	$ 23,558	23,558
Accumulated Amortization	$ 20,803	$ 19,959
Useful Lives	6 years 3 months 18 days