Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash paid during the period for:
Income taxes, net of refunds	$ (3,028)	$ 10,788
Interest, net of amounts capitalized	107,417	114,717
Significant non-cash investing and financing activities:
Accrued capital expenditures	87,815	108,056
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	434,997	4,562
Dividends accrued but not yet paid	88,066	82,824
APS
Cash paid during the period for:
Income taxes, net of refunds	0	35,573
Interest, net of amounts capitalized	100,991	107,169
Significant non-cash investing and financing activities:
Accrued capital expenditures	87,815	108,056
Right-of-use operating lease assets obtained in exchange for operating lease liabilities	434,997	4,562
Dividends accrued but not yet paid	$ 88,000	$ 82,800