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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 198,075	$ 172,595	$ 96,787
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on debt securities arising during the period	51,959	(11,229)	4,367
Change in retirement obligation	4,649	(8,180)	3,172
Unrealized gain (loss) on derivatives	217	484	514
Other comprehensive income (loss)	56,825	(18,925)	8,053
Comprehensive income	$ 254,900	$ 153,670	$ 104,840

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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