Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other intangible assets:
Gross Carrying Amount	$ 77,194	$ 75,083
Accumulated Amortization	(42,436)	(38,491)
Net Amount	34,758	36,592
Amortization expense	4,035	4,190	$ 5,002
Customer lists / relationships
Other intangible assets:
Gross Carrying Amount	51,804	51,804
Accumulated Amortization	(27,101)	(24,415)
Net Amount	24,703	27,389
Patents
Other intangible assets:
Gross Carrying Amount	10,319	10,319
Accumulated Amortization	(10,319)	(10,319)
Net Amount	0	0
Technology and other intangibles
Other intangible assets:
Gross Carrying Amount	12,871	12,270
Accumulated Amortization	(5,016)	(3,757)
Net Amount	7,855	8,513
In process research and development
Other intangible assets:
Gross Carrying Amount	2,200	690
Accumulated Amortization	0	0
Net Amount	$ 2,200	$ 690