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Long-Term Debt (Narrative) (Details)
3 Months Ended 6 Months Ended
May 31, 2018
USD ($)
Nov. 30, 2016
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Covenant To Actual Ratios [Line Items]              
Repayments of Long-term Lines of Credit         $ 25,800,000 $ 188,000,000  
Revolving credit facility present accordion provisions     $ 75,000,000   75,000,000    
Carrying value of the liability component     $ 319,418,000   319,418,000   $ 319,108,000
Deferred payments   $ 2,000,000          
Amortization of Debt Issuance Costs         $ 189,000 320,000  
Ratio Actual [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)     5.05   5.05    
Ratio of earnings to fixed cost obligations (in Ratio)     2.15   2.15    
Term Loan [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Revolving credit facility, maximum borrowing capacity     $ 150,000,000   $ 150,000,000    
Senior Notes [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Repayments of Long-term Lines of Credit $ 291,400,000            
Amortization of Debt Issuance Costs     $ 34,000 $ 11,000 $ 68,000 11,000  
Stated interest rate percentage     6.625%   6.625%    
Interest Expense, Debt     $ 5,400,000 1,900,000 $ 10,800,000 1,900,000  
Credit Agreement [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Amortization of Debt Issuance Costs           140,000  
Credit Agreement [Member] | Term Loan [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         2.125%    
Prime Rate Option [Member] | Line of Credit [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.00%    
Libor Margin Option [Member] | Line of Credit [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         2.00%    
Series of Individually Immaterial Business Acquisitions [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Interest Expense, Debt     $ 160,000 $ 201,000 $ 329,000 $ 425,000  
Revolving Credit Facility, Secured, Floating Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Weighted average interest rate     3.90% 4.20% 4.00% 4.00%  
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Carrying value of the liability component     $ 24,600,000   $ 24,600,000    
Revolving Credit Facility [Member] | Credit Agreement 2018 [Member]              
Debt Covenant To Actual Ratios [Line Items]              
Carrying value of the liability component             $ 27,100,000
Amortization of Debt Issuance Costs     $ 54,000 $ 45,000 $ 108,000