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Noncontrolling Interest (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 29, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2015
Noncontrolling Interest [Line Items]        
Ownership percentage by noncontrolling owners       33.00%
Proceeds from noncontrolling interests $ 2,000 $ 3,403 $ 3,443  
Return of equity to noncontrolling interests $ 1,000   $ 959  
67% in an entity        
Noncontrolling Interest [Line Items]        
Ownership percentage by parent       67.00%