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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2011 $ 52,879 $ 934 $ 28,150 $ 23,795
Sale of common stock 47,250 315 46,935   
Underwriting discount and offering expense (7,469)    (7,469)   
Reclassification of temporary equity 12,000    12,000   
Stock option expense 542    542   
Net income 25,367       25,367
Ending Balance at Dec. 31, 2012 130,569 1,249 80,158 49,162
Proceeds from exercise of stock options 944 9 935   
Stock option expense 358    358   
Net income 13,584       13,584
Ending Balance at Jun. 30, 2013 $ 145,455 $ 1,258 $ 81,451 $ 62,746