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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net sales | $ 567,080 | $ 487,076 | $ 349,189
Cost of sales | 458,253 | 399,721 | 286,952
Selling, general and administrative expenses | 78,113 | 72,051 | 45,803
Restructuring charges | 2,114 | 1,832 | 1,387
Income from operations | 28,600 | 13,472 | 15,047
Interest expense | (7,588) | (3,978) | (156)
Interest income and other, net | 4,720 | 276 | 274
Earnings before provision (benefit) for income taxes | 25,732 | 9,770 | 15,165
Provision (benefit) for income taxes | 6,535 | 1,167 | (743)
Net earnings available to common shareholders | 19,197 | 8,603 | 15,908
Class A [Member] |  |  |
Net earnings available to common shareholders | $ 3,331 | $ 1,492 | $ 2,868
Net earnings per common share: |  |  |
Common shares - basic and diluted (in dollars per share) | $ 1.53 | $ 0.69 | $ 1.32
Weighted-average shares outstanding: |  |  |
Common shares - basic and diluted (in shares) | 2,175 | 2,175 | 2,175
Dividends paid per common share: |  |  |
Common shares (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.24
Class B [Member] |  |  |
Net earnings available to common shareholders | $ 15,866 | $ 7,111 | $ 13,040
Net earnings per common share: |  |  |
Common shares - basic and diluted (in dollars per share) | $ 1.64 | $ 0.75 | $ 1.41
Weighted-average shares outstanding: |  |  |
Common shares - basic and diluted (in shares) | 9,698 | 9,491 | 9,240
Dividends paid per common share: |  |  |
Common shares (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.28

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