Long-Lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Long-lived assets	$ 76,552	[1]	$ 79,191	[1]
United States
Segment Reporting Information [Line Items]
Long-lived assets	62,241	[1]	60,098	[1]
Other international
Segment Reporting Information [Line Items]
Long-lived assets	$ 14,311	[1]	$ 19,093	[1]

[1] Long-lived assets are attributed to the countries that purchased the asset.