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Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues $ 104,031 $ 97,609 $ 194,802 $ 182,446
Revenues – related parties 2,032 5,628 3,426 6,518
Cost of goods sold 75,492 86,466 134,789 157,422
Cost of goods sold – related parties 1,725 752 12,345 1,738
Distribution 1,107 1,476 1,858 2,340
Distribution – related parties 113 143 229 263
Gross profit 27,626 14,400 49,007 27,201
Selling, general, and administrative expenses        
Compensation expense, (inclusive of $259 of stock based compensation for the three months ended 2012) 1,015 1,065 1,941 1,814
Other expense 762 848 1,268 1,439
Related party expense 83 86 166 121
Research and development expenses 791 829 1,707 1,672
2,651 2,828 5,082 5,046
Income from operations 24,975 11,572 43,925 22,155
Interest and dividend income 1,689 1,147 2,842 2,287
Interest expense (6) (9) (12) (15)
Gain/(loss) on marketable securities 2,030 (116) 2,089 198
Other (expense) / income (34) 96 (34) 44
3,679 1,118 4,885 2,514
Income before income taxes 28,654 12,690 48,810 24,669
Provision for income taxes 10,498 4,217 16,604 9,083
Net income 18,156 8,473 32,206 15,586
Other comprehensive loss from unrealized net losses on available-for-sale securities, net of tax of $(1,143) in 2013 and of $(730) in 2012 (1,836) (1,173) 3,543 (47)
Comprehensive income $ 16,320 $ 7,300 $ 35,749 $ 15,539
Earnings per common share        
Basic (in Dollars per share) $ 0.42 $ 0.21 $ 0.75 $ 0.38
Diluted (in Dollars per share) $ 0.42 $ 0.20 $ 0.75 $ 0.38
Weighted average shares outstanding        
Basic (in Shares) 43,334,441 41,319,057 43,132,398 41,316,958
Diluted (in Shares) 43,361,555 41,462,594 43,156,827 41,477,864