Segment Reporting - Reconciliation of Net Income to Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting [Abstract]
Net income	$ 56,747	$ 62,645
Add back:
Income tax provision	16,465	19,930
Interest income and other	(5,017)	(159)
Interest expense	4,861	4,746
Unallocated corporate expenses	23,591	22,103
Segment depreciation expense	7,146	6,364
Amortization of intangible assets	2,331	1,861
Total Adjusted Segment EBITDA	$ 106,124	$ 117,490