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1. Summary of Significant Accounting Policies - Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies - Earnings Per Share Details    
Numerator for basic and diluted earnings per share $ 21,005 $ 69,408
Denominator for basic earnings per share - weighted average number of common shares outstanding during the year 21,538 19,473
Incremental common shares attibutable to exercise of outstanding options and warrants 10,036 6,005
Denominator for diluted earnings per share 31,574 25,478
Basic earnings per share $ 0.98 $ 3.56
Diluted earnings per share $ 0.67 $ 2.72