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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Allowances on accounts receivable, current | $ 2,719 | $ 5,226
Accumulated depreciation on property and equipment | 824,108 | 755,272
Accumulated amortization on other intangible assets | $ 283,889 | $ 264,674
Common stock, par value | $ 0.00001 | $ 0.00001
Common stock, shares authorized | 600,000,000 | 600,000,000
Common stock, shares issued | 228,951,159 | 227,898,509
Common stock, shares outstanding | 144,194,115 | 152,907,166
Treasury stock, common shares | 84,757,044 | 74,991,343
Exchangeable Shares [Member] |  |
Exchangeable Shares, par value |  |
Common stock, shares issued | 6,876,042 | 6,876,042
Common stock, shares outstanding | 6,876,042 | 6,876,042
Series F Preferred Stock [Member] |  |
Preferred stock, par value | $ 0.00001 | $ 0.00001
Preferred stock, shares authorized | 1 | 1
Preferred stock, shares issued | 1 | 1
Preferred stock, shares outstanding | 1 | 1
Series G Preferred Stock [Member] |  |
Preferred stock, par value | $ 0.00001 | $ 0.00001
Preferred stock, shares authorized | 1 | 1
Preferred stock, shares issued | 1 | 1
Preferred stock, shares outstanding | 1 | 1

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