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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Supplemental Cash Flow Information [Line Items] |  |
Interest paid | $ 357,094 | $ 364,147
Income taxes paid | 11,740 | 23,865
Increase (decrease) in accounts payable for purchases of property and equipment | 1,390 | (5,399)
Purchase of property and equipment under capital leases and installment purchases | $ 40,295 | 41,331
Installment payment receivable for sale of subsidiary |  | $ 117,384

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