Property and Depreciation Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 38,824	$ 39,332	$ 38,588
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Net book value of assets held for sale	0	464
Net book value of sold assets held for sale	464	148
Gain on sale of assets held for sale	$ 197	2,004
Building
Property, Plant and Equipment [Line Items]
Estimated useful asset life	42 years
Furniture, Fixtures & Equipment and Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful asset life	3 years
Furniture, Fixtures & Equipment and Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful asset life	14 years
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property plant and equipment additions	$ 4,214	3,542
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Property plant and equipment additions	1,945	427
Capitalized Interest Costs
Property, Plant and Equipment [Line Items]
Interest costs capitalized	$ 44	$ 0	$ 225