Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	$ 51,527	$ 50,963
Finite-lived intangible assets, accumulated amortization	14,926	12,241
Total other intangible assets	63,157	62,593
Other intangible assets, net	48,231	50,352
Acquired Intangible Assets [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	49,736	49,159
Finite-lived intangible assets, accumulated amortization	14,830	12,124
Patents and technology
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	17,310	16,815
Finite-lived intangible assets, accumulated amortization	5,586	4,537
Customer lists
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	30,877	30,877
Finite-lived intangible assets, accumulated amortization	8,127	6,518
Trademarks and brand names
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	1,549	1,467
Finite-lived intangible assets, accumulated amortization	1,117	1,069
Deferred financing costs
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	1,791	1,804
Finite-lived intangible assets, accumulated amortization	96	117
Trademarks and brand names
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 11,630	$ 11,630