v2.4.0.6
Commitments and Contingencies Leases (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Leased Assets [Line Items]          
Operating Leases, Rent Expense $ 714 $ 616 $ 2,058 $ 1,725  
Deferred Rent Credit, Noncurrent 284   284   346
Capital Lease Obligations [Member] | Minimum [Member]
         
Leased Assets [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.80%   1.80%    
Capital Lease Obligations [Member] | Maximum [Member]
         
Leased Assets [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 9.00%   9.00%    
Capital Addition Purchase Commitments [Member] | Capital Lease Obligations [Member]
         
Leased Assets [Line Items]          
Debt Instrument, Face Amount         3,100
Maintenance and Support [Member]
         
Leased Assets [Line Items]          
Recorded Unconditional Purchase Obligation $ 1,785   $ 1,785   $ 2,611