Intangible Assets (Schedule Of Indefinite-Lived And Definite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	$ 81,022	$ 59,918
Accumulated amortization	(15,622)	(12,945)
Net book value	65,400	46,973
Trade Names and Trademarks [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	5,011	800
Net book value	5,011	800
Software Under Development [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	13,527	13,049
Net book value	13,527	13,049
Customer Relationships [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	32,929	22,800
Accumulated amortization	(7,724)	(7,097)
Net book value	25,205	15,703
Software [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	29,555	23,269
Accumulated amortization	(7,898)	(5,848)
Net book value	$ 21,657	$ 17,421