Goodwill and Other Intangibles - Other Intangible (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Other Intangible Assets
Gross Carrying Amount	$ 42,422		$ 42,422		$ 42,430
Accumulated Amortization	28,131		28,131		27,040
Other intangible assets not subject to amortization	8,900		8,900
Amortization expense of other intangible assets	300	$ 300	977	$ 1,500
Trade names
Other Intangible Assets
Gross Carrying Amount	8,528		8,528		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	10,199		10,199		10,358
Accumulated Amortization	6,072		$ 6,072		5,584
Useful Lives			16 years 10 months 24 days
Proprietary software
Other Intangible Assets
Gross Carrying Amount	23,306		$ 23,306		23,165
Accumulated Amortization	$ 22,059		$ 22,059		$ 21,456
Useful Lives			8 years 4 months 24 days