Commitments (Schedule Of Future Minimum Lease Payments Under Capital Leases And Non-Cancelable Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments [Abstract]
Capital Leases, 2012	$ 961
Capital Leases, 2013	674
Capital Leases , 2014	554
Capital Leases, 2015	244
Capital Leases, 2016	114
Capital Leases, Thereafter	0
Capital Leases, Total	2,547
Capital Leases, Less amount representing interest	(349)
Capital Leases, Total net of interest	2,198
Capital Leases, Current maturities of capital lease obligations	800
Capital Leases, Capital lease obligations, net of current maturities	1,398
Operating Leases, 2012	19,151
Operating Leases, 2013	17,273
Operating Leases, 2014	13,209
Operating Leases, 2015	12,252
Operating Leases, 2016	11,912
Operating Leases, Thereafter	14,243
Operating Leases, Total	$ 88,040