Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2017

Supplemental Cash Flow Information [Abstract]

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

	Three Months Ended March 31,
	2017			2016
Supplemental disclosure of cash flow information:
Interest paid	$	144,452		$	111,469
Income taxes paid	796			6,773
Supplemental disclosure of non-cash investing and financing activities:
Increase (decrease) in accounts payable for purchases of property and equipment	(17,876		)	(8,638		)
Purchase of property and equipment under capital leases and installment purchases	9,226			12,269