Business Segments, Concentration of Business, and Credit Risk and Significant Customers (Details 3) (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Dec. 31, 2013 tannery	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 International Net Sales	Dec. 31, 2012 International Net Sales	Dec. 31, 2011 International Net Sales	Dec. 31, 2013 Net Trade Accounts Receivable Customer One customer	Dec. 31, 2012 Net Trade Accounts Receivable Customer One customer	Dec. 31, 2013 Net Trade Accounts Receivable Customer Two	Dec. 31, 2012 Long-lived assets Minimum	Dec. 31, 2012 Net sales Minimum	Dec. 31, 2013 US Long-lived assets	Dec. 31, 2012 US Long-lived assets	Dec. 31, 2013 All other countries Long-lived assets	Dec. 31, 2012 All other countries Long-lived assets
Cash and cash equivalents
Money market fund accounts	$ 154,105	$ 52,650
Cash	83,020	57,597
Total cash and cash equivalents	237,125	110,247	263,606	445,226
Long-lived assets, which consist of property and equipment, by major country
Property and equipment, by major country	$ 174,066	$ 125,370											$ 136,726	$ 89,423	$ 37,340	$ 35,947
Concentration risks
Number of customers considered concentration risk								1	1
Concentration risk (as a percent)								19.70%	18.80%	11.40%	10.00%	10.00%
Concentration risk benchmark (as a percent)					33.00%	31.20%	31.40%
Number of tanneries used to source products	2