Other Intangible Assets (Schedule Of Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,530	$ 71,455
Accumulated Amortization	(41,828)	(35,832)
Other intangible assets, net	31,702	35,623
Favorable leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,400
Other intangible assets, net	1,400
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52,430	51,755
Accumulated Amortization	(34,327)	(29,402)
Other intangible assets, net	$ 18,103	$ 22,353
Useful Lives (in years)	11 years	11 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,400	$ 15,400
Accumulated Amortization	(4,491)	(3,850)
Other intangible assets, net	$ 10,909	$ 11,550
Useful Lives (in years)	24 years	24 years
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,300	$ 4,300
Accumulated Amortization	(3,010)	(2,580)
Other intangible assets, net	$ 1,290	$ 1,720
Useful Lives (in years)	10 years	10 years