Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Notes Payable - Summary of Long-Term Debt (Details)

v3.10.0.1
Long-Term Debt and Notes Payable - Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
Capital Lease Obligations $ 6,644 $ 8,960
Long-term debt and capital lease obligations 233,982 271,767
Less Current Maturities 1,870 2,689
Long-term debt and capital lease obligations excluding current maturities $ 232,112 $ 269,078
Line of Credit | Revolving Credit Facility | LIBOR    
Debt Instrument    
Effective interest rate   3.70%
Line of Credit | Revolving Credit Facility | LIBOR | Minimum    
Debt Instrument    
Interest rate on revolving credit at LIBOR rate 1.00%  
Line of Credit | Revolving Credit Facility | LIBOR | Maximum    
Debt Instrument    
Interest rate on revolving credit at LIBOR rate 1.50%  
Line of Credit | Revolving Credit Facility | Fifth Amended and Restated Credit Agreement    
Debt Instrument    
Long-term debt $ 227,000 $ 262,000
Other Bank Debt    
Debt Instrument    
Long-term debt $ 338 $ 807