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Commitments (Schedule Of Aggregate Future Minimum Lease Payments Under Operating Leases By Material Lease Agreements) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
renewal
Operating Leased Assets [Line Items]  
Future Minimum Lease Payment $ 68,389
Building Lease #1&2 [Member]
 
Operating Leased Assets [Line Items]  
Original Term (Expiration) May 01, 2017
Number of Renewal Options 2
Period of Renewal Option, in years 5 years
Future Minimum Lease Payment 38,483
Building Lease #3 [Member]
 
Operating Leased Assets [Line Items]  
Original Term (Expiration) Jul. 01, 2018
Number of Renewal Options 1
Period of Renewal Option, in years 5 years
Future Minimum Lease Payment 21,070
Building Lease #4 [Member]
 
Operating Leased Assets [Line Items]  
Original Term (Expiration) Dec. 01, 2015
Number of Renewal Options 1
Period of Renewal Option, in years 3 years
Future Minimum Lease Payment 8,692
Other [Member]
 
Operating Leased Assets [Line Items]  
Future Minimum Lease Payment $ 144