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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 3,043	$ 4,023
Accumulated depreciation, property assets	$ 467,787	$ 440,586
Common stock - par value	$ 0.01	$ 0.01
Common stock - shares authorized	250,000,000	250,000,000
Common stock - shares issued	109,423,881	109,353,001
Treasury stock - shares at cost	56,369,752	56,369,752

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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