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CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands | Sep. 30, 2017 USD ($) vote $ / shares shares | Dec. 31, 2016 USD ($) vote $ / shares shares
--- | --- | ---
Accounts receivable - trade, allowance for doubtful accounts | $ | $ 694 | $ 1,069
Property, plant and equipment, accumulated depreciation and amortization | $ | $ 798,612 | $ 837,122
Class A Common Stock |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01
Common stock, authorized shares (in shares) | 100,000,000 | 100,000,000
Common stock, issued shares (in shares) | 41,055,000 | 40,572,000
Common stock, outstanding shares (in shares) | 41,055,000 | 40,572,000
Class B Common Stock |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01
Common stock, authorized shares (in shares) | 1,000,000 | 1,000,000
Common stock, issued shares (in shares) | 988,000 | 988,000
Common stock, outstanding shares (in shares) | 988,000 | 988,000
Common stock, number of votes per share | vote | 10 | 10

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