Significant Accounting Policies - (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Equipment and furniture	$ 205,328	$ 210,612
Less accumulated amortization	(171,415)	(173,699)
Net property, plant and equipment	33,913	36,913
Depreciation	$ 13,586	14,894	$ 15,530
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Equipment and furniture | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Equipment and furniture | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Equipment and furniture, capital lease assets
Property, Plant and Equipment [Line Items]
Equipment and furniture	$ 1,088	1,351
Less accumulated amortization	(767)	(980)
Net property, plant and equipment	321	371
Depreciation	100	200	300
Property, plant and equipment, capital lease assets
Property, Plant and Equipment [Line Items]
Depreciation	$ 13,600	$ 14,700	$ 15,400