Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash paid during the period for:
Income taxes, net of refunds	$ 2,562	$ 2,692
Interest, net of amounts capitalized	146,691	143,116
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 91,315	$ 36,718