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NATURE OF OPERATIONS - Condensed Consolidated Statements Of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating expenses:            
Cost of product sales $ 28,688   $ 27,876   $ 50,547 $ 49,760
Income from operations 13,068   11,502   23,677 20,871
Income before income tax expense 13,055   11,421   24,674 20,642
Income tax expense (3,015)   (2,788)   (5,611) (4,796)
Net income $ 10,040 $ 9,025 $ 8,633 $ 7,213 $ 19,063 $ 15,846
Net income per share:            
Basic $ 0.41   $ 0.35   $ 0.79 $ 0.65
Diluted $ 0.41   $ 0.35   $ 0.79 $ 0.65
Error corrections in accounts payable and cost of goods sold            
Operating expenses:            
Cost of product sales $ 28,688       $ 50,547  
Income from operations 13,068       23,677  
Income before income tax expense 13,055       24,674  
Income tax expense (3,015)       (5,611)  
Net income $ 10,040       $ 19,063  
Net income per share:            
Basic $ 0.41       $ 0.79  
Diluted $ 0.41       $ 0.79  
As Originally Reported | Error corrections in accounts payable and cost of goods sold            
Operating expenses:            
Cost of product sales $ 30,557       $ 52,416  
Income from operations 11,199       21,808  
Income before income tax expense 11,186       22,805  
Income tax expense (2,590)       (5,186)  
Net income $ 8,596       $ 17,619  
Net income per share:            
Basic $ 0.36       $ 0.73  
Diluted $ 0.36       $ 0.73  
Adjustments | Error corrections in accounts payable and cost of goods sold            
Operating expenses:            
Cost of product sales $ (1,869)       $ (1,869)  
Income from operations 1,869       1,869  
Income before income tax expense 1,869       1,869  
Income tax expense (425)       (425)  
Net income $ 1,444       $ 1,444  
Net income per share:            
Basic $ 0.05       $ 0.06  
Diluted $ 0.05       $ 0.06