Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 49,744	$ 29,714	$ 128,292	$ 67,082
Income tax expense using estimated annual effective income tax rate	14,844	15,194	38,378	33,809
Changes in effective tax rates	(785)	1,895	0	0
Change in estimate for the impact of Tax Cuts and Jobs Act of 2017	0	(162)	0	(1,971)
Impact of discrete items, net	(323)	(2,241)	(434)	(2,444)
Income tax expense	$ 13,736	$ 14,686	$ 37,944	$ 29,394

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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