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CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
vote
$ / shares
shares
Dec. 31, 2021
USD ($)
vote
$ / shares
shares
Accounts receivable - trade, allowance for credit losses | $ $ 3,879 $ 3,276
Accumulated depreciation and amortization | $ $ 1,016,382 $ 973,094
Class A Common Stock    
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 50,690,000 50,423,000
Common stock, shares outstanding (in shares) 50,690,000 50,423,000
Class B Common Stock    
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000,000 1,000,000
Common stock, shares issued (in shares) 988,000 988,000
Common stock, shares outstanding (in shares) 988,000 988,000
Votes per share held (in votes) | vote 10 10