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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
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, 2012
Dec. 31, 2011
Dec. 31, 2010
Income (loss) before income taxes:                      
Total income before income taxes                 $ 4,560 $ 71,642 $ 12,024
Provision for income taxes:                      
Federal                 0 0 0
State and foreign                 3,545 2,167 1,147
Total current provision                 3,545 2,167 1,147
Deferred:                      
Federal                 98 23,443 1,188
State and foreign                 (2,831) 495 (1,657)
Total deferred provision (benefit)                 (2,733) 23,938 (469)
Total provision for income taxes 95 383 (884) 1,218 22,727 1,543 1,158 677 812 26,105 678
Domestic Tax Authority [Member]
                      
Income (loss) before income taxes:                      
Total income before income taxes                 3,411 62,510 (4,405)
Foreign Tax Authority [Member]
                      
Income (loss) before income taxes:                      
Total income before income taxes                 $ 1,149 $ 9,132 $ 16,429