Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2016

Supplemental Cash Flow Information [Abstract]

Supplemental Disclosure of Cash Flow Information and Non-cash Investing and Financing Activities

	Three Months Ended March 31,
	2016			2015
Supplemental disclosure of cash flow information:
Interest paid	$	111,469		$	120,949
Income taxes paid	6,773			2,498
Supplemental disclosure of non-cash investing and financing activities:
Increase (decrease) in accounts payable for purchases of property and equipment	(8,638		)	(13,557		)
Purchase of property and equipment under capital leases and installment purchases	12,269			12,407