Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 489,970	$ 491,076	$ 477,395
Income taxes paid (refund)	28,771	18,770	15,591
Increase (Decrease) in accounts payable for purchases of property and equipment	(7,042)	11,407	(1,082)
Purchase of property and equipment under capital leases and installment purchases	60,270	43,609	57,361
Installment payment receivable for sale of subsidiary	$ 117,384	$ 0	$ 0