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Organization and Summary of Significant Accounting Policies (Schedule of Effects of Change in Accounting for Inventory on the Statement of Income (Loss)) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 406,081 | $ 376,158 | $ 348,945
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 46,320 | 53,412 | 38,203
Net income |  |  |  |  |  |  |  |  | $ 46,320 | $ 53,412 | $ 38,305
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.52 | $ 2.94 | $ 2.23
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.48 | $ 2.86 | $ 2.16
Change from LIFO to FIFO |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | $ 376,158 | $ 348,945
Income from continuing operations, net of tax | $ 6,577 | $ 12,546 | $ 13,554 | $ 13,643 | $ 7,247 | $ 20,407 | $ 11,056 | $ 14,702 |  | 53,412 | 38,203
Net income |  |  |  |  |  |  |  |  |  | $ 53,412 | $ 38,305
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.94 | $ 2.23
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.86 | $ 2.16
Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | $ 6,577 | $ 12,455 | $ 13,540 | $ 13,627 | $ 7,013 | $ 20,388 | $ 10,902 | $ 14,580 |  |  |
Scenario, Previously Reported | Change from LIFO to FIFO |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | $ 376,972 | $ 349,782
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  |  | 52,883 | 37,659
Net income |  |  |  |  |  |  |  |  |  | $ 52,883 | $ 37,761
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.91 | $ 2.20
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.83 | $ 2.13
Restatement Adjustment | Change from LIFO to FIFO |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | $ (814) | $ (837)
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  |  | 529 | 544
Net income |  |  |  |  |  |  |  |  |  | $ 529 | $ 544
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.03 | $ 0.03
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.03 | $ 0.03

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