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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Supplemental Cash Flow Information [Line Items] |  |
Interest paid | $ 217,783 | $ 244,977
Income taxes paid | 10,186 | 8,489
Increase (decrease) in accounts payable for purchases of property and equipment | (10,197) | (10,102)
Purchase of property and equipment under capital leases and installment purchases | 25,444 | $ 25,769
Installment payment receivable for sale of subsidiary | $ 117,384 |

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