Intangible Assets (Schedule Of Indefinite-Lived And Definite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	$ 297,940	$ 86,542
Accumulated amortization	(36,846)	(14,238)
Net book value	261,094	72,304
Trade Names and Trademarks [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	53,566	5,585
Accumulated amortization	(461)	(50)
Net book value	53,105	5,535
Customer Relationships [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	125,234	25,618
Accumulated amortization	(9,487)	(1,072)
Net book value	115,747	24,546
Software Assets [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	110,201	36,566
Accumulated amortization	(26,898)	(13,116)
Net book value	83,303	23,450
Software Under Development [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	8,939	18,773
Net book value	$ 8,939	$ 18,773