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Long-Term Debt (Long-term Debt Table) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Carrying value of the liability component $ 319,577,000   $ 319,577,000   $ 319,108,000
Debt issuance costs (900,000)   (900,000)   (955,000)
Current maturities on long-term debt (1,679,000)   (1,679,000)   (2,015,000)
Long-term debt, excluding current maturities 23,234,000   23,234,000   33,070,000
Revolving credit facility present accordion provisions 75,000,000   75,000,000    
Amortization of Debt Issuance Costs     289,000 $ 420,000  
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 59,000 $ 41,000 167,000    
Credit Agreement [Member]          
Debt Instrument [Line Items]          
Amortization of Debt Issuance Costs       $ 172,000  
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]          
Debt Instrument [Line Items]          
Carrying value of the liability component $ 7,813,000   $ 7,813,000   $ 8,940,000