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Long-Term Debt (Long-term Debt Table) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Carrying value of the liability component $ 319,418,000   $ 319,418,000   $ 319,108,000
Debt issuance costs (847,000)   (847,000)   (955,000)
Current maturities on long-term debt (1,895,000)   (1,895,000)   (2,015,000)
Long-term debt, excluding current maturities 30,060,000   30,060,000   33,070,000
Revolving credit facility present accordion provisions 75,000,000   75,000,000    
Amortization of Debt Issuance Costs     189,000 $ 320,000  
Credit Agreement 2018 [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Carrying value of the liability component         27,100,000
Amortization of Debt Issuance Costs 54,000 $ 45,000 108,000    
Credit Agreement [Member]          
Debt Instrument [Line Items]          
Amortization of Debt Issuance Costs       $ 140,000  
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]          
Debt Instrument [Line Items]          
Carrying value of the liability component $ 8,202,000   $ 8,202,000   $ 8,940,000