Description of Business and Summary of Significant Accounting Policies (Long-lived assets by geographic location) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long-Lived Assets [Line Items]
Total	$ 38,667	$ 45,606	$ 36,441
United States [Member]
Long-Lived Assets [Line Items]
Total	28,013	33,740	24,239
China [Member]
Long-Lived Assets [Line Items]
Total	4,991	5,444	6,340
Switzerland [Member]
Long-Lived Assets [Line Items]
Total	$ 5,663	$ 6,422	$ 5,862