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Segment Revenues (Details) (USD $) | 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
Revenues - United States |  |  |  |  |  |  |  |  | $ 66,694,000 | $ 55,856,000
Revenues - International |  |  |  |  |  |  |  |  | 17,676,000 | 17,446,000
Total Revenues | 19,535,000 | 20,363,000 | 27,594,000 | 16,878,000 | 15,836,000 | 19,036,000 | 24,029,000 | 14,401,000 | 84,369,770 | 73,301,864
United States |  |  |  |  |  |  |  |  |  |
Revenues - United States |  |  |  |  |  |  |  |  | 66,694,000 | 55,856,000
Total Revenues |  |  |  |  |  |  |  |  | 67,510,000 | 56,663,000
Canada |  |  |  |  |  |  |  |  |  |
Revenues - International |  |  |  |  |  |  |  |  | 8,808,000 | 8,514,000
Total Revenues |  |  |  |  |  |  |  |  | 8,808,000 | 8,514,000
Europe |  |  |  |  |  |  |  |  |  |
Revenues - International |  |  |  |  |  |  |  |  | 8,052,000 | 8,125,000
Total Revenues |  |  |  |  |  |  |  |  | 8,052,000 | 8,125,000
Other International |  |  |  |  |  |  |  |  |  |
Revenues - International |  |  |  |  |  |  |  |  | $ 816,000 | $ 807,000

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