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CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDER’S EQUITY - USD ($)
$ in Thousands
Partner's Capital
Common Stock
Treasury stock
Additional paid-in-capital
Retained earnings
Total
Partners Capital at Dec. 31, 2017 $ 124,271          
Shares issued (124,271)          
Shares issued upon incorporation   $ 20   $ 124,251   $ 124,271
Shares issued upon incorporation (in shares)   20,000,000        
Net income         $ 5,360 5,360
Ending Balance at Mar. 31, 2018   $ 20   124,251 5,360 129,631
Ending Balance (in shares) at Mar. 31, 2018   20,000,000        
Partners Capital at Dec. 31, 2017 124,271          
Partners Capital at Sep. 30, 2018 0          
Net income           18,735
Ending Balance at Sep. 30, 2018   $ 20   124,251 18,734 143,005
Ending Balance (in shares) at Sep. 30, 2018   20,000,000        
Beginning Balance at Mar. 31, 2018   $ 20   124,251 5,360 129,631
Beginning Balance (in shares) at Mar. 31, 2018   20,000,000        
Net income         6,888 6,888
Ending Balance at Jun. 30, 2018   $ 20   124,251 12,248 136,519
Ending Balance (in shares) at Jun. 30, 2018   20,000,000        
Partners Capital at Sep. 30, 2018 $ 0          
Net income         6,486 6,486
Ending Balance at Sep. 30, 2018   $ 20   124,251 18,734 143,005
Ending Balance (in shares) at Sep. 30, 2018   20,000,000        
Beginning Balance at Dec. 31, 2018   $ 24   167,743 21,513 $ 189,280
Beginning Balance (in shares) at Dec. 31, 2018   24,000,000       24,000,000
Shares issued upon incorporation   $ 1   6,694   $ 6,695
Shares issued upon incorporation (in shares)   600,000        
Share based compensation expense and stock units vested       234   234
Share based compensation expense and stock units vested (in shares)   17,143        
Net income         7,213 7,213
Ending Balance at Mar. 31, 2019   $ 25   174,671 28,726 203,422
Ending Balance (in shares) at Mar. 31, 2019   24,617,143        
Beginning Balance at Dec. 31, 2018   $ 24   167,743 21,513 $ 189,280
Beginning Balance (in shares) at Dec. 31, 2018   24,000,000       24,000,000
Net income           $ 21,984
Ending Balance at Sep. 30, 2019   $ 25 $ (3,060) 174,959 43,497 $ 215,421
Ending Balance (in shares) at Sep. 30, 2019   24,617,143       24,617,143
Beginning Balance at Mar. 31, 2019   $ 25   174,671 28,726 $ 203,422
Beginning Balance (in shares) at Mar. 31, 2019   24,617,143        
Share based compensation expense and stock units vested       187   187
Purchase of treasury stock     (3,060)     (3,060)
Net income         8,633 8,633
Ending Balance at Jun. 30, 2019   $ 25 (3,060) 174,858 37,359 209,182
Ending Balance (in shares) at Jun. 30, 2019   24,617,143        
Share based compensation expense and stock units vested       101   101
Net income         6,138 6,138
Ending Balance at Sep. 30, 2019   $ 25 $ (3,060) $ 174,959 $ 43,497 $ 215,421
Ending Balance (in shares) at Sep. 30, 2019   24,617,143       24,617,143