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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Allowance for doubtful accounts | $ 3,244 | $ 3,614
Accumulated depreciation, property assets | $ 508,629 | $ 482,448
Common stock - par value | $ 0.01 | $ 0.01
Common stock - shares authorized | 250,000,000 | 250,000,000
Common stock - shares issued | 109,519,369 | 109,441,911
Treasury stock - shares at cost | 56,369,752 | 56,369,752

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