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Basis Of Presentation And General Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]          
Income tax expense $ 1,587,000 $ 0 $ 3,082,000 $ 1,587,000 $ 5,899,000
Effective tax rate       33.00%