Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Summary of long-lived assets by geography
Total long-lived assets	$ 262,517	$ 285,115	$ 311,502
Americas:
United States	230,884	254,113	282,002
Other Americas	35	34	25
Total Americas	230,919	254,147	282,027
Total Europe, Middle East and Africa [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	4,813	6,341	6,276
GERMANY
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	797	773	1,060
Other Europe, Middle East and Africa [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	4,016	5,568	5,216
JAPAN
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	3,960	4,532	5,130
Asia [Member]
Summary of long-lived assets by geography
Long-Lived Assets in Individual Foreign Countries	$ 22,825	$ 20,095	$ 18,069