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Income Taxes: Effective tax rate (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income (Loss) from Continuing Operations Attributable to Parent [Abstract] |  |  |
Income from continuing operations, United States | $ 62,204,000 | $ 63,575,000 | $ 46,669,000
Income from continuing operations, foreign | (365,000) | 2,847,000 | 1,116,000
Income from continuing operations | 61,839,000 | 66,422,000 | 47,785,000
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate | 21,644,000 | 23,247,000 | 16,724,000
Income Tax Reconciliation, State and Local Income Taxes | 1,356,000 | 1,460,000 | 1,007,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 35.00% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes | 2.20% | 2.20% | 2.10%
Income Tax Reconciliation, Tax Credits | (1,465,000) | (1,171,000) | (121,000)
Effective Income Tax Rate Reconciliation, Tax Credits | (2.40%) | (1.80%) | (0.30%)
Income Tax Reconciliation, Tax Exempt Income | (23,000) | (45,000) | (33,000)
Income Tax Reconciliation, Deductions, Qualified Production Activities | (1,559,000) | (1,508,000) | (997,000)
Effective Income Tax Rate Reconciliation, Tax Exempt Income | (0.10%) | (0.10%) | (0.10%)
Effective Income Tax Rate Reconciliation, Deductions, Qualified Production Activities | (2.50%) | (2.30%) | (2.00%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential | 1.00% | (0.30%) | 2.70%
Income Tax Reconciliation, Foreign Income Tax Rate Differential | 605,000 | (230,000) | 1,282,000
Effective Income Tax Rate, Continuing Operations | 33.20% | 32.70% | 37.40%
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Net, Current | 4,293,000 | 4,081,000 |
Deferred Tax Assets, Net, Noncurrent Classification [Abstract] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 5,642,000 | 4,759,000 |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | (5,247,000) | (7,144,000) |
Income Tax Expense (Benefit) [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | 21,072,000 | 19,246,000 | 15,331,000
Current State and Local Tax Expense (Benefit) | 2,080,000 | 1,246,000 | 1,200,000
Current Foreign Tax Expense (Benefit) | 678,000 | 785,000 | 1,109,000
Current Income Tax Expense (Benefit) | 23,830,000 | 21,277,000 | 17,640,000
Deferred Federal Income Tax Expense (Benefit) | (2,276,000) | 169,000 | (781,000)
Deferred State and Local Income Tax Expense (Benefit) | (796,000) | 326,000 | 439,000
Deferred Foreign Income Tax Expense (Benefit) | (200,000) | (19,000) | 564,000
Income Tax Expense (Benefit) | 20,558,000 | 21,753,000 | 17,862,000
Deferred Income Tax Expense (Benefit) | (3,272,000) | 476,000 | 222,000
Tax Benefit from Stock Options Exercised | 4,600,000 | 4,300,000 | 1,700,000
Increase (Decrease) in Income Taxes Payable | 700,000 |  |
Deferred tax liability, Mexican subsidiary | 2,300,000 |  |
Unrecognized Tax Benefits [Abstract] |  |  |
Unrecognized Tax Benefits | 4,978,000 | 4,411,000 | 5,306,000
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions | 156,000 | 494,000 | (649,000)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions | 490,000 | 764,000 | 518,000
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities | (230,000) | (392,000) | (764,000)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations | (1,158,000) | (299,000) | 0
Unrecognized Tax Benefits | 4,236,000 | 4,978,000 | 4,411,000
Undistributed foreign subsidiaries earnings | 13,500,000 | 14,000,000 |
State income taxes [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 437,000 | 343,000 |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | 1,751,000 | (1,481,000) |
Foreign Country [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 400,000 | 429,000 |
Deferred Tax Assets, Net, Noncurrent Classification [Abstract] |  |  |
Deferred Income Taxes and Other Assets, Noncurrent | 983,000 | 526,000 |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | 2,301,000 | 2,633,000 |
Accruals other [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 1,881,000 | 1,377,000 |
Deferred Tax Assets, Net, Noncurrent Classification [Abstract] |  |  |
Deferred Income Taxes and Other Assets, Noncurrent | 536,000 | 347,000 |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | 186,000 | 186,000 |
Tax credits [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 441,000 | 452,000 |
Allowance for Doubtful Accounts [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 101,000 | 102,000 |
Inventory Valuation Reserve [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 1,247,000 | 1,378,000 |
Current deferred tax asset [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Gross, Current | 4,507,000 | 4,081,000 |
Valuation allowance of deferred tax assets, current [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Valuation Allowance | (214,000) | 0 |
Depreciation and Amortization [Member] |  |  |
Deferred Tax Assets, Net, Noncurrent Classification [Abstract] |  |  |
Deferred Income Taxes and Other Assets, Noncurrent | (458,000) | (523,000) |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | 6,429,000 | 6,862,000 |
Tax credits state [Member] |  |  |
Deferred Tax Assets, Net, Noncurrent Classification [Abstract] |  |  |
Deferred Income Taxes and Other Assets, Noncurrent | 4,927,000 | 4,409,000 |
Non-current deferred tax asset, gross total [Member] |  |  |
Deferred Tax Assets, Net, Noncurrent Classification [Abstract] |  |  |
Deferred Income Taxes and Other Assets, Noncurrent | 5,988,000 | 4,759,000 |
Valuation allowance of deferred tax assets, noncurrent [Member] |  |  |
Deferred Tax Assets, Net, Current Classification [Abstract] |  |  |
Deferred Tax Assets, Valuation Allowance | (346,000) | 0 |
Acquired future tax deductions [Member] |  |  |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | 515,000 | 460,000 |
Stock-based compensation [Member] |  |  |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | (5,581,000) | (3,843,000) |
Foreign currency translation adjustments [Member] |  |  |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | (354,000) | (635,000) |
Noncurrent deferred tax liability [Member] |  |  |
Deferred Tax Liabilities [Abstract] |  |  |
Noncurrent deferred tax liability | 5,247,000 | 7,144,000 |
Allowance for Doubtful Accounts [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | (59,000) | (24,000) | (66,000)
Inventory Valuation Reserve [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 143,000 | 1,147,000 | (1,137,000)
Accruals other [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | (2,375,000) | (464,000) | (1,792,000)
State and Local Jurisdiction [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 177,000 | (7,000) | (290,000)
Acquired future tax deductions [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | 50,000 | 293,000 | 300,000
Depreciation and Amortization [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | (700,000) | (205,000) | 2,820,000
Tax credits [Member] |  |  |
Income Tax Expense (Benefit) [Abstract] |  |  |
Deferred Income Tax Expense (Benefit) | $ (508,000) | $ (264,000) | $ 387,000

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