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6. Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2010
Debt Instrument [Line Items]      
Debt, Long-term and Short-term, Combined Amount $ 439,500    
Debt and Lease Obligation   $ 439,400  
Other Long-term Debt, Current 1,800 500  
Long-term debt, net of current maturities 437,680 438,937  
Unsecured Debt [Member] | Senior Notes 4.875% due 2020 [Member]      
Debt Instrument [Line Items]      
Unsecured Debt 425,000 425,000  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 1,000 1,300  
Debt Instrument, Interest Rate, Stated Percentage     4.875%
Debt Instrument, Redemption Price, Percentage 100.00%    
Long-term debt $ 424,000 423,700 $ 422,600
Debt Instrument, Interest Rate, Effective Percentage     4.946%
Face amount of debt sold     $ 425,000
Capital Lease Obligations [Member] | Capital Leases and Other Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt and Lease Obligation, Including Current Maturities 0 15,700  
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]      
Debt Instrument [Line Items]      
Other Long-term Debt 15,500 $ 0  
Line of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit maximum borrowing capacity 200,000    
Outstanding borrowings $ 0    
Line of Credit Facility, Interest Rate at Period End 3.455%    
Standby Letters of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit maximum borrowing capacity $ 200