Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income before provision for income taxes		$ 29,714	$ 26,950	$ 67,082	$ 70,316
Income tax expense using estimated annual effective income tax rate		15,194	10,331	33,809	26,961
Changes in effective tax rates		1,895	173	0	0
Impact of discrete items, net		(2,241)	(4,032)	(2,444)	(4,444)
Income tax expense		14,686	6,472	29,394	22,517
Provisional amount for tax act	$ 28,845
Change in estimate for the impact of Tax Cuts and Jobs Act of 2017		$ (162)	$ 0	$ (1,971)	$ 0

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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