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Intangible assets, Maturity Schedule (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2013 $ 1,321
2014 1,091
2015 1,069
2016 1,028
2017 16
Total $ 4,525
Weighted average remaining useful life 3 years 7 months 6 days