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Fair Value Measurements (Narratives) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Assets            
Change in unrealized gains on available for sale securities     $ 54,000   $ 237,000  
ASU 2016-01            
Assets            
Change in unrealized gains on available for sale securities $ 500,000          
Level 1 Investments            
Assets            
Unrealized holding gain on investments           $ 500,000
Level 2 Assets and Liabilities            
Assets            
Transfers of assets between Level 1 and Level 2   $ 0   $ 0   0
Transfers of liabilities between Level 1 and Level 2   0   0   0
Long-term debt, fair value   185,300,000   185,300,000   $ 200,000,000
Level 3 Assets and Liabilities            
Assets            
Transfers of assets between Level 2 and Level 3   0 0 0 0  
Transfers of liabilities between Level 2 and Level 3   0 0 0 0  
Intangible asset and goodwill impairment   $ 0 $ 0 $ 0 $ 0