Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid during the period for:
Income taxes, net of refunds	$ (3,002)	$ 1
Interest, net of amounts capitalized	53,723	63,764
Significant non-cash investing and financing activities:
Accrued capital expenditures	100,868	95,879
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	2,311	2,293
APS
Cash paid during the period for:
Income taxes, net of refunds	0	0
Interest, net of amounts capitalized	52,034	61,387
Significant non-cash investing and financing activities:
Accrued capital expenditures	100,868	95,879
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	$ 2,311	$ 2,293