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Basis of Presentation and Other Information - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Prepaid expenses and other $ 10,579 $ 11,146   $ 10,579   $ 11,146
Retained earnings 507,458 430,010   507,458   430,010
Property, plant and equipment, net 413,602 363,087   413,602   363,087
Deferred income taxes 146,771 137,567   146,771   137,567
Depreciation expense (11,995)   $ (10,741) (36,010) $ (33,807)  
Income tax expense (benefit) 141   507 (684) (108)  
Net income $ 34,921   $ 14,354 $ 77,448 $ 41,414  
Increase (decrease) in earnings per share, basic (in dollars per share) $ 0.70   $ 0.29 $ 1.55 $ 0.83  
Increase (decrease) in earnings per share, diluted (in dollars per share) $ 0.70   $ 0.29 $ 1.55 $ 0.83  
Revision of Prior Period, Error Correction, Adjustment | Prior Period Errors            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Prepaid expenses and other   2,700       2,700
Deferred tax liabilities, net   700       700
Retained earnings   2,000       2,000
Property, plant and equipment, net   1,400       1,400
Deferred income taxes   400       400
Depreciation expense   1,400       1,400
Income tax expense (benefit)   400       400
Net income   $ 1,000       $ 1,000
Increase (decrease) in earnings per share, basic (in dollars per share)   $ 0.02       $ 0.02
Increase (decrease) in earnings per share, diluted (in dollars per share)   $ 0.02       $ 0.02