Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current income taxes
Federal	$ 51,058	$ 50,911	$ 63,758
State	6,252	6,482	12,226
Foreign	6,650	3,368	7,487
Total	63,960	60,761	83,471
Deferred income taxes
Federal	(2,580)	(6,083)	1,003
State	(209)	414	(1,067)
Foreign	(1,303)	12	(3)
Total	(4,092)	(5,657)	(67)
Income taxes
Federal	48,478	44,828	64,761
State	6,043	6,896	11,159
Foreign	5,347	3,380	7,484
Total income taxes	59,868	55,104	83,404
Foreign income before income taxes	60,851	51,409	108,738
Actual income taxes differed from that obtained by applying the statutory federal income tax rate to income before income taxes
Computed expected income taxes	71,945	64,282	99,842
State income taxes, net of federal income tax benefit	4,435	3,562	6,912
Foreign rate differential	(16,399)	(12,908)	(24,783)
Other	(113)	168	1,433
Total income taxes	59,868	55,104	83,404
Deferred tax assets (liabilities), current:
Uniform capitalization adjustment to inventory	5,492	6,870
Bad debt and other reserves	10,655	11,582
State taxes	508	799
Prepaid expenses	(2,193)	(1,961)
Accrued bonus	5,071	0
Foreign currency hedge	348	0
Total deferred tax assets, current	19,881	17,290
Deferred tax assets (liabilities), noncurrent:
Amortization and impairment of intangible assets	4,603	5,312
Depreciation of property and equipment	(6,034)	(8,524)
Share-based compensation	11,226	11,906
Foreign currency translation	667	244
Deferred rent	4,028	3,247
Acquisition cost	755	834
Other	0	111
Net operating loss carryforwards	506	242
Total deferred tax assets, noncurrent	15,751	13,372
Net deferred tax assets	$ 35,632	$ 30,662