Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized intangible assets
Original Cost	$ 183,034	$ 188,089
Accumulated Amortization	83,896	75,196
Net Book Value	99,138	112,893
Customer list
Amortized intangible assets
Original Cost	40,570	41,151
Accumulated Amortization	21,706	18,437
Net Book Value	18,864	22,714
Non-compete agreement
Amortized intangible assets
Original Cost	3,313	4,665
Accumulated Amortization	2,753	3,563
Net Book Value	560	1,102
Supply agreement
Amortized intangible assets
Original Cost	9,060	9,806
Accumulated Amortization	5,824	5,699
Net Book Value	3,236	4,107
Technology
Amortized intangible assets
Original Cost	13,400	15,500
Accumulated Amortization	4,857	5,616
Net Book Value	8,543	9,884
Trademarks and patents
Amortized intangible assets
Original Cost	17,985	18,185
Accumulated Amortization	7,682	5,882
Net Book Value	10,303	12,303
Lease intangible
Amortized intangible assets
Original Cost	11,564	12,420
Accumulated Amortization	3,602	5,707
Net Book Value	7,962	6,713
Software
Amortized intangible assets
Original Cost	86,723	84,339
Accumulated Amortization	37,112	28,372
Net Book Value	49,611	55,967
Other
Amortized intangible assets
Original Cost	419	2,023
Accumulated Amortization	360	1,920
Net Book Value	$ 59	$ 103