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Organization and Summary of Significant Accounting Policies Segment and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Operating_Segment
Reporting_Unit
Dec. 31, 2012
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Number of operating segments                         1    
Number of reporting units                         1    
Total revenue $ 46,475 $ 40,877 $ 39,036 $ 42,138 $ 44,194 $ 40,499 $ 38,394 $ 39,439 $ 39,762 $ 36,251 $ 33,726 $ 34,600 $ 168,526 $ 162,526 $ 144,339
Revenue, Percentage                         99.00% 100.00% 100.00%
Long-Lived Assets 246,769       189,206               246,769 189,206  
Long-Lived Assets, Percentage                         100.00% 100.00%  
U.S.
                             
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Total revenue                         83,086 79,635 67,756
Revenue, Percentage                         49.00% 49.00% 47.00%
Long-Lived Assets 184,974       176,611               184,974 176,611  
Long-Lived Assets, Percentage                         75.00% 93.00%  
Europe
                             
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Total revenue                         52,687 46,005 42,339
Revenue, Percentage                         31.00% 28.00% 29.00%
Long-Lived Assets 60,853       11,234               60,853 11,234  
Long-Lived Assets, Percentage                         25.00% 6.00%  
Asia-Pacific
                             
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Total revenue                         32,753 36,886 34,244
Revenue, Percentage                         19.00% 23.00% 24.00%
Long-Lived Assets $ 942       $ 1,361               $ 942 $ 1,361  
Long-Lived Assets, Percentage                         0.00% 1.00%