Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid during the period for:
Income taxes, net of refunds	$ (827)	$ (3,002)
Interest, net of amounts capitalized	53,885	53,723
Significant non-cash investing and financing activities:
Accrued capital expenditures	79,597	100,868
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	785	2,311
APS
Cash paid during the period for:
Income taxes, net of refunds	0	0
Interest, net of amounts capitalized	53,153	52,034
Significant non-cash investing and financing activities:
Accrued capital expenditures	79,597	100,868
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	$ 785	$ 2,311