Long Term Debt (Details)	12 Months Ended				12 Months Ended			12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended							12 Months Ended			12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 JPY (¥)	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 1 [Member] USD ($)		Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 1 [Member] USD ($)	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 2 [Member] USD ($)	Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, U.S. dollar denominated 2 [Member] USD ($)	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, total U.S. dollar-denominated debt [Member] USD ($)		Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member]	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member] JPY (¥)	Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member] USD ($)	Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 1 [Member] JPY (¥)	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 2 [Member]	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 2 [Member] JPY (¥)	Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 2 [Member] USD ($)	Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 2 [Member] JPY (¥)	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 3 [Member] JPY (¥)	Dec. 31, 2011 2003 multi-currency uncommitted shelf facility, Japanese yen denominated 3 [Member] JPY (¥)	Dec. 31, 2012 2003 multi-currency uncommitted shelf facility, total Japanese yen-denominated debt [Member] USD ($)		Dec. 31, 2012 Revcolving Credit Facility Member [Member] USD ($)		Dec. 31, 2011 Revcolving Credit Facility Member [Member] USD ($)	Dec. 31, 2012 2010 committed loan, U.S. dollar denominated [Member] USD ($)		Dec. 31, 2011 2010 committed loan, U.S. dollar denominated [Member] USD ($)	Dec. 31, 2012 Multi-Currency Uncommitted Shelf Facility, Japanese Yen Denominated 3 [Member] JPY (¥)
Debt Instrument [Line Items]
Original principal amount - facilities					$ 40,000,000	[1]		$ 20,000,000					¥ 3,100,000,000				¥ 2,300,000,000			¥ 2,200,000,000				$ 0	[2]		$ 30,000,000			¥ 8,000,000,000	[3]
Balance - facilities	0			0	22,900,000		28,600,000	14,300,000	17,100,000				900,000,000	17,400,000	1,300,000,000		1,600,000,000	25,300,000	1,900,000,000	1,600,000,000	1,900,000,000					0	18,000,000		24,000,000	8,000,000,000
Interest rate - facilities (in hundredths)					6.20%			6.20%				1.70%	1.70%			2.60%	2.60%			3.30%										1.70%
Repayment terms					Notes due July 2016 with annual principal payments that began in July 2010.			Notes due January 2017 with annual principal payments that began in January 2011.				Notes due April 2014 with annual principal payments that began in April 2008.	Notes due April 2014 with annual principal payments that began in April 2008.			Notes due September 2017 with annual principal payments that began in September 2011.	Notes due September 2017 with annual principal payments that began in September 2011.			Notes due January 2017 with annual principal payments that began in January 2011.										Notes due May 2022 with annual principal payments that begin in May 2016.
Interest rate description - other borrowings																											Variable 30 day: 1.21%
Amortization per quarter																											500,000
Current portion of long-term debt	39,019,000	28,608,000								8,600,000	[4]											12,400,000	[4]				18,000,000	[4]
Interest expense	5,200,000	4,800,000	5,800,000
Minimum cash compensating balance per loan covenant	65,000,000
Maturities of Long-term Debt [Abstract]
2013	39,019,000
2014	21,019,000
2015	15,881,000
2016	29,026,000
2017	23,312,000
Thereafter	65,725,000
Total	$ 193,982,000

[1] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;">⁽¹⁾</td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">On May 25, 2012, we (a) entered into an amendment and restatement of our multi-currency uncommitted shelf facility to extend the termination date to May 25, 2015 and provide for the issuance of up to $150 million in additional senior promissory notes; (b) entered into an amendment and restatement of our revolving credit facility to extend the termination date to May 9, 2014; and (c) terminated pledges and guarantees of our subsidiaries as security for the multi-currency uncommitted shelf facility, committed loan and revolving credit facility. &#160;The committed loan continues to be secured by deeds of trust with respect to our corporate headquarters and distribution center in Provo, Utah.</td></tr></table></div>

[2] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; margin-left: 18pt; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;">⁽⁴⁾</td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">On February 5, 2013, we entered into a second amendment of the amended and restated credit agreement. &#160;The amendment increased the commitment amount from $25.0 million to $100.0 million from February 2013 to February 2014, after which the commitment amount returns to the current level over a three-month period.</td></tr></table></div>

[3] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; margin-left: 18pt; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;">⁽³⁾</td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">On May 31, 2012, we issued a series of yen denominated senior promissory notes under the multi-currency uncommitted shelf facility with an aggregate principal amount of 8.0 billion yen.</td></tr></table></div>

[4] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; margin-left: 18pt; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;">⁽²⁾</td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">The current portion of our long-term debt (i.e. becoming due in the next 12 months) includes $12.4 million of the balance of our Japanese yen-denominated debt under the multi-currency uncommitted shelf facility, $8.6 million of the balance on our U.S. dollar denominated debt under the 2003 multi-currency uncommitted shelf facility and $18.0 million of our committed loan.</td></tr></table></div>