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Income Taxes: Provision for income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 18,601 | $ 13,860 | $ 14,575
Current State and Local Tax Expense (Benefit) | 745 | (1,305) | 2,145
Current Foreign Tax Expense (Benefit) | 1,426 | 2,100 | (70)
Current Income Tax Expense (Benefit) | 20,772 | 14,655 | 16,650
Deferred Federal Income Tax Expense (Benefit) | 4,524 | (2,325) | 164
Deferred State and Local Income Tax Expense (Benefit) | (960) | 988 | (996)
Deferred Foreign Income Tax Expense (Benefit) | 378 | 139 | (3,522)
Deferred Income Tax Expense (Benefit) | 3,942 | (1,198) | (4,354)
Income Tax Expense (Benefit) | 24,714 | 13,457 | 12,296
Allowance for Doubtful Accounts [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 0 | 4 | 4
Inventory Valuation Reserve [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 284 | (488) | 341
Accruals other [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | (2,977) | (1,326) | (470)
State and Local Jurisdiction [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 502 | (4) | 552
Acquired future tax deductions [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 3,139 | 96 | 40
Depreciation and Amortization [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 1,080 | (780) | (3,850)
Operating Income (Loss) [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 195 | 62 | 0
Tax credits [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | (635) | 1,238 | (971)
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | $ 2,354 | $ 0 | $ 0

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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