Goodwill and Other Intangibles - Other Intangible (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Other Intangible Assets
Gross Carrying Amount	$ 42,618		$ 42,618		$ 42,430
Accumulated Amortization	27,795		27,795		27,040
Other intangible assets not subject to amortization	8,900		8,900
Amortization expense of other intangible assets	400	$ 500	691	$ 1,200
Impairment of other intangible assets			0
Trade names
Other Intangible Assets
Gross Carrying Amount	8,523		8,523		8,518
Trading rights
Other Intangible Assets
Gross Carrying Amount	339		339		339
Other
Other Intangible Assets
Gross Carrying Amount	50		50		50
POSIT trade name
Other Intangible Assets
Other intangible assets not subject to amortization	8,400		8,400
Customer related intangibles
Other Intangible Assets
Gross Carrying Amount	10,457		10,457		10,358
Accumulated Amortization	5,908		$ 5,908		5,584
Useful Lives			17 years
Proprietary software
Other Intangible Assets
Gross Carrying Amount	23,249		$ 23,249		23,165
Accumulated Amortization	$ 21,887		$ 21,887		$ 21,456
Useful Lives			9 years 3 months 18 days