Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Quarterly Financial Data [Abstract]
Net revenues	$ 801,870	$ 732,476	$ 742,365	$ 697,192	$ 777,857	$ 690,925	$ 693,227	$ 662,677	$ 2,973,903	$ 2,824,686	[1],[2]	$ 2,736,080	[1],[2]
Gross margin	689,019	628,559	633,616	588,906	655,918	584,988	583,915	560,219	2,540,100	2,385,040		2,331,191
Income from operations	202,471	164,779	145,147	165,563					677,960	570,997		560,164
Income from continuing operations					(283,889)	126,720	108,829	70,325	575,667	21,985		469,855
Loss from discontinued operations, net of tax					0	0	0	(42,704)	0	(42,704)		66,257
Net income	$ 165,718	$ 158,857	$ 106,833	$ 144,259	$ (283,889)	$ 126,720	$ 108,829	$ 27,621	$ 575,667	$ (20,719)		$ 536,112
Income (loss) from continuing operations (USD per share)					$ (1.93)	$ 0.84	$ 0.72	$ 0.46	$ 4.23	$ 0.15		$ 3.03
Loss from discontinued operations (USD per share)					0.00	0.00	0.00	(0.28)		(0.28)
Basic net earnings (loss) per share (USD per share)	$ 1.24	$ 1.18	$ 0.79	$ 1.04	(1.93)	0.84	0.72	0.18	4.23	(0.13)		3.46
Income (loss) from continuing operations (USD per share)					(1.93)	0.82	0.70	0.44	3.94	0.14		2.99
Loss from discontinued operations (USD per share)					0.00	0.00	0.00	(0.27)		(0.27)
Diluted net earnings (loss) per share (USD per share)	$ 1.15	$ 1.08	$ 0.73	$ 0.99	$ (1.93)	$ 0.82	$ 0.70	$ 0.17	$ 3.94	$ (0.13)		$ 3.41

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method of adoption of therevenue recognition standard. See Note 2 for further information regarding the Company’s adoption of the revenuerecognition standard.

[2] Prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.