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Basis of Presentation and Other Information - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Prepaid expenses and other   $ 56,392 $ 60,527   $ 56,392   $ 60,527
Retained earnings   472,537 430,010   472,537   430,010
Property, plant and equipment, net   703,012 701,514   703,012   701,514
Deferred income taxes   144,273 137,567   144,273   137,567
Depreciation expense   34,832   $ 42,353 71,743 $ 83,532  
Income tax expense   10,284   4,524 14,576 8,734  
Net income   $ 29,247   $ 13,150 $ 42,527 $ 27,060  
Increase (decrease) in earnings per share, basic (in dollars per share)   $ 0.59   $ 0.26 $ 0.85 $ 0.54  
Increase (decrease) in earnings per share, diluted (in dollars per share)   $ 0.58   $ 0.26 $ 0.85 $ 0.54  
Affiliated Entity              
Subsequent Event [Line Items]              
Negotiation period 90 days            
Option to purchase assets, period 60 days            
Purchase option, value of business percentage 90.00%            
Option to purchase network, period 60 days            
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     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