Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Current tax expense (benefit):
Income tax provision	$ 13,009	$ 15,420
Effective tax rate	17.40%	28.20%
Current income tax expense (benefit)	$ 5,100
Deferred tax expense (benefit):
Deferred Income Tax Expense (Benefit), Excluding Discontinued Operations	$ 20,400