Income Taxes Provision for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	$ 9,653	$ 12,617	$ 20,004
Current Federal Tax Expense (Benefit)	6,851	492	2,774
Current State and Local Tax Expense (Benefit)	2,532	1,865	2,263
Current Foreign Tax Expense (Benefit)	7,994	9,136	3,170
Current Income Tax Expense (Benefit)	17,377	11,493	8,207
Deferred Federal Income Tax Expense (Benefit)	(6,720)	(9,118)	(20,878)
Deferred State and Local Income Tax Expense (Benefit)	(325)	(3,072)	(4,619)
Deferred Foreign Income Tax Expense (Benefit)	3,340	(5,722)	(71)
Deferred Income Tax Expense (Benefit)	(3,705)	(17,912)	(25,568)
PROVISION FOR INCOME TAXES	$ 13,672	$ (6,419)	$ (17,361)