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Inventories - Schedule of Changes in Accounting Principles (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cost of sales | $ 100,058 | $ 102,626
Net income | $ 14,928 | $ 13,643
Basic earnings per share (in dollars per share) | $ 0.83 | $ 0.74
Diluted earnings per share (in dollars per share) | $ 0.82 | $ 0.72
As Originally Reported Under LIFO |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cost of sales |  | $ 102,696
Net income |  | $ 13,627
Basic earnings per share (in dollars per share) |  | $ 0.74
Diluted earnings per share (in dollars per share) |  | $ 0.72
Effect of Change |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cost of sales |  | $ (70)
Net income |  | $ 16
Basic earnings per share (in dollars per share) |  | $ 0.00
Diluted earnings per share (in dollars per share) |  | $ 0.00

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