Goodwill and Other Intangibles - Other Intangible (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Other Intangible Assets
Gross Carrying Amount	$ 55,814		$ 55,814
Accumulated Amortization	31,834		31,203
Other intangible assets not subject to amortization	8,900
Amortization expense of other intangible assets	600	$ 800
Impairment of other intangible assets	0
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
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		23,322
Accumulated Amortization	10,821		$ 10,400
Useful Lives			14 years 3 months 18 days
Proprietary software
Other Intangible Assets
Gross Carrying Amount	23,558		$ 23,558
Accumulated Amortization	$ 21,013		$ 20,803
Useful Lives			6 years 3 months 18 days