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CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
vote
$ / shares
shares
Dec. 31, 2018
USD ($)
vote
$ / shares
shares
Accounts receivable - trade, allowance for doubtful accounts | $ $ 1,468 $ 931
Property, plant and equipment, accumulated depreciation and amortization | $ $ 844,874  
Property, plant and equipment, accumulated depreciation and amortization | $   $ 878,701
Class A Common Stock    
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, authorized shares 100,000,000 100,000,000
Common stock, issued shares 46,803,000 41,944,000
Common stock, outstanding shares 46,803,000 41,944,000
Common stock, votes (in votes per share) | vote 1  
Class B Common Stock    
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, authorized shares 1,000,000 1,000,000
Common stock, issued shares 988,000 988,000
Common stock, outstanding shares 988,000 988,000
Common stock, votes (in votes per share) | vote 10 10