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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Statement Of Financial Position [Abstract] |  |
Allowance for doubtful accounts on accounts receivable | $ 4,994 | $ 2,719
Preferred stock, par value | $ 1 | $ 1
Preferred stock, shares authorized | 10,000,000 | 10,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 475,000,000 | 475,000,000
Common stock, shares issued | 169,375,743 | 168,711,131
Common stock held in treasury, shares | 59,283 | 82,954

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