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Consolidation and Nature of Operations (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash paid during the period for:    
Income taxes, net of refunds $ 10,788 $ 10,032
Interest, net of amounts capitalized 114,717 104,249
Significant non-cash investing and financing activities:    
Accrued capital expenditures 108,056 65,995
Right-of-use operating lease assets obtained in exchange for operating lease liabilities 4,562 0
Dividends accrued but not yet paid 82,824 77,821
APS    
Cash paid during the period for:    
Income taxes, net of refunds 35,573 24,689
Interest, net of amounts capitalized 107,169 98,478
Significant non-cash investing and financing activities:    
Accrued capital expenditures 108,056 65,995
Right-of-use operating lease assets obtained in exchange for operating lease liabilities 4,562 0
Dividends accrued but not yet paid $ 82,800 $ 77,800