Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 12,163	$ 6,909	$ 18,332	$ 4,257
Discrete tax expense (benefit)	800	$ (2,300)	2,300	$ 2,200
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months	$ 5,000		$ 5,000