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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
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