Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Comprehensive Income
Net income	$ 259,175	$ 229,011	$ 203,319
Other comprehensive income, net of tax:
Unrealized gains (losses) on hedging derivatives, net of taxes of $107 for the year ended December 31, 2019	(390)
Unrealized gains (losses) on hedging derivatives, net of taxes of $39 and $6 for the years ended December 31, 2018 and 2017, respectively		118	11
Unrealized gains on available-for-sale securities, net of taxes of $0, $103 and $108 for the years ended December 31, 2019, 2018 and 2017, respectively		309	175
Reclassification of expired interest rate corridor to interest expense, net of taxes of $257	843
Comprehensive income	$ 259,628	$ 229,438	$ 203,505