Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Long-Term Debt (Details)

v3.8.0.1
Long-Term Debt - Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 10, 2017
May 09, 2013
Debt Instrument [Line Items]        
Debt issuance costs $ (12,769) $ (13,208)    
Other 3,860 3,947    
Total debt 1,058,614 1,024,703    
Less current maturities (53,957) (61,314)    
Long-term debt 1,004,657 963,389    
2016 Revolving Credit Facility        
Debt Instrument [Line Items]        
2016 Revolving Credit Facility $ 100,000 $ 75,000    
Interest rate 2.25% 2.25%    
5.0% Senior Subordinate Notes due 2023        
Debt Instrument [Line Items]        
Senior Subordinated Notes $ 289,273 $ 289,273    
Total debt $ 289,273 289,273    
Stated interest rate on debt agreement 5.00%     5.00%
6.125% Senior Subordinate Notes due 2027        
Debt Instrument [Line Items]        
Senior Subordinated Notes $ 250,000 250,000    
Total debt $ 250,000 250,000    
Stated interest rate on debt agreement 6.125%   6.125%  
Mortgage notes        
Debt Instrument [Line Items]        
Mortgage notes to finance companies-fixed rate, bearing interest from 3.51% to 7.03% $ 232,822 199,972    
Mortgage notes to finance companies-variable rate, bearing interest at 1.50 to 2.90 percentage points above one-month or three-month LIBOR $ 195,428 $ 219,719    
Mortgage notes | Minimum        
Debt Instrument [Line Items]        
Mortgage notes to finance companies-fixed rate, percentage 3.51%      
Mortgage notes to finance companies-variable rate, percentage 1.50%      
Mortgage notes | Maximum        
Debt Instrument [Line Items]        
Mortgage notes to finance companies-fixed rate, percentage 7.03%      
Mortgage notes to finance companies-variable rate, percentage 2.90%