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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 25, 2017
Mar. 26, 2016
Mar. 28, 2015
Unrecognized tax benefits   $ 6,209   $ 6,892 $ 6,929 $ 7,495
Interest and penalties accrued related to unrecognized tax benefits   400   $ 400    
State net operating loss carryforwards available   $ 5,400        
Carryforward expiration period   Mar. 31, 2038        
Federal tax rate   31.60% [1] 35.00% 35.00% [1] 35.00% [1]  
Income tax benefit, change in tax rate, reduction of basis points [2]   $ (4,707)        
Scenario, Forecast [Member]            
Federal tax rate 21.00%          
Maximum [Member]            
Fiscal years under examination   2017        
Minimum [Member]            
Fiscal years under examination   2015        
[1] For fiscal 2018, represents the blended rate of 35% for 9/12 of the year and 21% for 3/12 of the year.
[2] Represents the net discrete adjustment to income tax expense from the remeasurement of our net deferred tax assets at the lower U.S. corporate income tax rate.