Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Notes Payable - Principal Maturities of Long-Term Debt (Details)

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Long-Term Debt and Notes Payable - Principal Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2019 $ 1,870 $ 2,689
2020 2,133  
2021 2,067  
2022 912  
2023 227,000  
Thereafter 0  
Long-term debt and capital lease obligations $ 233,982 $ 271,767