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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income $ 100,190 $ 99,703 $ 152,321 $ 124,833
Other comprehensive income:        
Reclassification adjustment for loss on derivative instruments included in net income, tax 36 36 73 72
Reclassification adjustment for loss on derivative instruments included in net income, net of tax 112 112 223 223
Postretirement liability adjustment:        
Amortization of postretirement liability losses included in net periodic benefit cost, tax 160 155 311 304
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax 457 480 923 942
Net unrealized gain (loss) on available-for-sale investments:        
Net unrealized gain (loss) on available-for-sale investments arising during the period, tax (13) (4) (25) 32
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax (52) (13) (96) 122
Reclassification adjustment for loss on available-for-sale investments included in net income, tax 6 2 15 2
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax 25 7 60 6
Net unrealized gain (loss) on available-for-sale investments (27) (6) (36) 128
Other comprehensive income 542 586 1,110 1,293
Comprehensive income attributable to common stockholders $ 100,732 $ 100,289 $ 153,431 $ 126,126