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Stock-Based Compensation (Details) (USD $)
6 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
In 2007 [Member]
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
In 2008 [Member]
Jun. 30, 2012
1999 Plan [Member]
Jun. 30, 2012
1999 Plan [Member]
Stock Options [Member]
Jun. 30, 2012
1999 Plan [Member]
Stock Options [Member]
Subsequent to 1999 [Member]
Dec. 31, 2008
1999 Plan [Member]
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2008
1999 Plan [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2007
1999 Plan [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2009
2009 Plan [Member]
Jun. 30, 2012
2009 Plan [Member]
Mar. 31, 2012
2009 Plan [Member]
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2012
2009 Plan [Member]
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Award vesting period         5 years 3 years             5 years
Plan expiration date       May 13, 2009                  
Expiration period         10 years                
Granted (in shares)             2,000 1,750 3,000     29,514  
Grant date fair value (in dollars per share)             $ 11.37 $ 12.80 $ 17.40     $ 7.90  
Unrecognized compensation cost related to restricted stock grants $ 219,000 $ 0 $ 0                    
Stock reserved for issuance (in shares)                     330,486    
Terms of Award                   All rights must be granted or awarded within ten years from the May 7, 2009 effective date of the 2009 Plan.