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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
May 01, 2018
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Summary of Significant Accounting Policies        
Common stock dividend declared, percentage of shares outstanding 5.00%      
Allowance for doubtful accounts   $ 250 $ 250  
Number of states in which the Company operates | item   48    
Impairment of long-lived assets   $ 0 0 $ 0
Impairment of Intangible Assets   $ 0 $ 0 $ 0
Federal statutory effective income tax rate   21.00% 35.00% 35.00%