Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Income [Abstract]
Revenue	$ 2,247,047	$ 2,569,495	$ 3,176,718
Cost of sales	489,510	478,434	505,806
Gross profit	1,757,537	2,091,061	2,670,912
Operating expenses:
Selling expenses	951,372	1,116,572	1,476,772
General and administrative expenses	561,463	622,301	640,028
Total operating expenses	1,512,835	1,738,873	2,116,800
Operating income	244,702	352,188	554,112
Other income (expense), net (Note 23)	(32,743)	(53,681)	2,828
Income before provision for income taxes	211,959	298,507	556,940
Provision for income taxes	78,913	109,331	192,052
Net income	$ 133,046	$ 189,176	$ 364,888
Net income per share [Abstract]
Basic (in dollars per share)	$ 2.29	$ 3.20	$ 6.23
Diluted (in dollars per share)	$ 2.25	$ 3.11	$ 5.94
Weighted-average common shares outstanding (000s):
Basic (in shares)	57,997	59,073	58,606
Diluted (in shares)	59,057	60,887	61,448