Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Supplemental Cash Flow Information [Line Items]
Interest paid	$ 420,317	$ 357,094
Income taxes paid	13,853	11,740
Increase (decrease) in accounts payable for purchases of property and equipment	(5,282)	1,390
Purchase of property and equipment under capital leases and installment purchases	25,189	40,295
Preferred Stock [Member]
Supplemental Cash Flow Information [Line Items]
Preferred Stock Dividends Declared, Not Paid	$ 29,935	$ 10,997