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Employee Retirement Plans (Schedule Of Contributions Made By The Company To Each Multiemployer Plan) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Contributions $ 328 $ 333 $ 307
National Integrated Group Pension Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Contributions 222 202 186
Sheet Metal Workers' National Pension Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Contributions 78 98 50
Sheet Metal Workers' Pension Plan Of Northern California [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Contributions 28 33 63
Western Metal Industry Pension Fund [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Contributions       $ 8