Information about Geographic Areas Schedule of Long-lived Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Long-lived Assets [Line Items]
Long-Lived Assets	$ 175,075	$ 178,835
United States
Long-lived Assets [Line Items]
Long-Lived Assets	147,390	149,254
Germany
Long-lived Assets [Line Items]
Long-Lived Assets	18,956	20,205
Rest of the world [Member]
Long-lived Assets [Line Items]
Long-Lived Assets	$ 8,729	$ 9,376