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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Revolving credit facility $ 11,500 $ 95,000
Notes payable   13,296
8% senior notes 321,950 321,057
Line of credit, senior note payable, equipment notes payable and senior note 333,450 429,353
Current portion of revolving credit facility (11,500)  
Current portion of notes payable   (1,212)
Long term debt $ 321,950 $ 428,141