Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid during the period for:
Income taxes, net of refunds	$ (3,028)	$ 12,488
Interest, net of amounts capitalized	155,623	166,907
Significant non-cash investing and financing activities:
Accrued capital expenditures	84,022	85,099
APS
Cash paid during the period for:
Income taxes, net of refunds	0	35,573
Interest, net of amounts capitalized	148,713	157,593
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 84,022	$ 85,099