Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 470,655	$ 489,970	$ 491,076
Income taxes paid (refund)	13,821	28,771	18,770
Increase (Decrease) in accounts payable for purchases of property and equipment	17,922	(7,042)	11,407
Purchase of property and equipment under capital leases and installment purchases	52,322	60,270	43,609
Installment payment receivable for sale of subsidiary	$ 0	$ 117,384	$ 0