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Consolidated Balance Sheets (Parenthetical) $ in Thousands | Mar. 31, 2016 USD ($) Vote $ / shares shares | Dec. 31, 2015 USD ($) Vote $ / shares shares
--- | --- | ---
Accounts receivable - trade, allowance for doubtful accounts | $ | $ 989 | $ 988
Property, plant and equipment, accumulated depreciation and amortization | $ | $ 802,815 | $ 789,766
Class A Common Stock [Member] |  |
Common stock, authorized shares | 100,000,000 | 100,000,000
Common stock, par value | $ / shares | $ 0.01 | $ 0.01
Common stock, issued shares | 40,243,000 | 40,064,000
Common stock, outstanding shares | 40,243,000 | 40,064,000
Class B Common Stock [Member] |  |
Common stock, authorized shares | 1,000,000 | 1,000,000
Common stock, par value | $ / shares | $ 0.01 | $ 0.01
Common stock, votes (in votes per share) | Vote | 10 | 10
Common stock, issued shares | 988,000 | 988,000
Common stock, outstanding shares | 988,000 | 988,000

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