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Income Taxes: Income tax (Tables) | 12 Months Ended
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Dec. 31, 2012
Income Taxes [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income from continuing operations before taxes for the years ended December 31, 2012, 2011 and 2010 is as follows:
|  | 2012 |  | 2011 |  | 2010
United States |  | $ | 62,204 |  |  | $ | 63,575 |  |  | $ | 46,669 |
Foreign |  | (365 | ) |  | 2,847 |  |  | 1,116 |
|  | $ | 61,839 |  |  | $ | 66,422 |  |  | $ | 47,785 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The provision (benefit) for income taxes for the years ended December 31, 2012, 2011 and 2010 is as follows:
|  | 2012 |  | 2011 |  | 2010
Current: |  |  |  |  |  |  |  |  |
Federal |  | $ | 21,072 |  |  | $ | 19,246 |  |  | $ | 15,331 |
State |  | 2,080 |  |  | 1,246 |  |  | 1,200 |
Foreign |  | 678 |  |  | 785 |  |  | 1,109 |
|  | 23,830 |  |  | 21,277 |  |  | 17,640 |
Deferred: |  |  |  |  |  |  |  |  |
Federal |  | $ | (2,276 | ) |  | $ | 169 |  |  | $ | (781 | )
State |  | (796 | ) |  | 326 |  |  | 439 |
Foreign |  | (200 | ) |  | (19 | ) |  | 564 |
|  | (3,272 | ) |  | 476 |  |  | 222 |
|  | $ | 20,558 |  |  | $ | 21,753 |  |  | $ | 17,862 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Reconciliations of the provision for income taxes at the statutory rate to our effective tax rate for the years ended December 31, 2012, 2011 and 2010 are as follows:
|  | 2012 |  | 2011 |  | 2010
|  | Amount |  | Percent |  | Amount |  | Percent |  | Amount |  | Percent
Federal tax at the expected statutory rate |  | $ | 21,644 |  |  | 35.0 | % |  | $ | 23,247 |  |  | 35.0 | % |  | $ | 16,724 |  |  | 35.0 | %
State income tax, net of federal effect |  | 1,356 |  |  | 2.2 | % |  | 1,460 |  |  | 2.2 | % |  | 1,007 |  |  | 2.1 | %
Tax credits |  | (1,465 | ) |  | (2.4 | )% |  | (1,171 | ) |  | (1.8 | )% |  | (121 | ) |  | (0.3 | )%
Tax-exempt interest and dividends |  | (23 | ) |  | (0.1 | )% |  | (45 | ) |  | (0.1 | )% |  | (33 | ) |  | (0.1 | )%
Domestic production activities/other |  | (1,559 | ) |  | (2.5 | )% |  | (1,508 | ) |  | (2.3 | )% |  | (997 | ) |  | (2.0 | )%
Foreign income tax |  | 605 |  |  | 1.0 | % |  | (230 | ) |  | (0.3 | )% |  | 1,282 |  |  | 2.7 | %
|  | $ | 20,558 |  |  | 33.2 | % |  | $ | 21,753 |  |  | 32.7 | % |  | $ | 17,862 |  |  | 37.4 | %
Deferred tax provision table text block [Table Text Block] | The components of our deferred income tax provision for the years ended December 31, 2012, 2011 and 2010 are as follows:
|  | 2012 |  | 2011 |  | 2010
Allowance for doubtful accounts |  | $ | (59 | ) |  | $ | (24 | ) |  | $ | (66 | )
Inventory reserves |  | 143 |  |  | 1,147 |  |  | (1,137 | )
Accruals |  | (2,375 | ) |  | (464 | ) |  | (1,792 | )
State income taxes |  | 177 |  |  | (7 | ) |  | (290 | )
Acquired future tax deductions |  | 50 |  |  | 293 |  |  | 300 |
Depreciation and amortization |  | (700 | ) |  | (205 | ) |  | 2,820 |
Tax credits |  | (508 | ) |  | (264 | ) |  | 387 |
|  | $ | (3,272 | ) |  | $ | 476 |  |  | $ | 222 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2012 |  | 2011
Current deferred tax assets: |  |  |  |  |  |
State income taxes |  | $ | 437 |  |  | $ | 343 |
Foreign |  | 400 |  |  | 429 |
Accruals/other |  | 1,881 |  |  | 1,377 |
Tax credits |  | 441 |  |  | 452 |
Allowance for doubtful accounts |  | 101 |  |  | 102 |
Inventory reserves |  | 1,247 |  |  | 1,378 |
Current deferred tax asset before valuation allowance |  | $ | 4,507 |  |  | $ | 4,081 |
Valuation allowance |  | (214 | ) |  | — |
|  | 4,293 |  |  | 4,081 |
Non-current deferred tax asset: |  |  |  |  |  |
Foreign |  | $ | 983 |  |  | $ | 526 |
Accruals/other |  | 536 |  |  | 347 |
Depreciation and amortization |  | (458 | ) |  | (523 | )
Tax credits state |  | 4,927 |  |  | 4,409 |
Non-current deferred tax asset before valuation allowance |  | $ | 5,988 |  |  | $ | 4,759 |
Valuation allowance |  | $ | (346 | ) |  | $ | — |
|  | $ | 5,642 |  |  | $ | 4,759 |
Non-current deferred tax liability: |  |  |  |  |  |
State income taxes |  | $ | (1,751 | ) |  | $ | (1,481 | )
Foreign |  | (2,301 | ) |  | (2,633 | )
Accruals/other |  | (186 | ) |  | (186 | )
Depreciation and amortization |  | (6,429 | ) |  | (6,862 | )
Acquired future tax deductions |  | (515 | ) |  | (460 | )
Stock-based compensation |  | 5,581 |  |  | 3,843 |
Foreign currency translation adjustments |  | 354 |  |  | 635 |
|  | $ | (5,247 | ) |  | $ | (7,144 | )
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | . The following table summarizes our cumulative gross unrecognized tax benefits for 2012, 2011 and 2010 :
|  | 2012 |  | 2011 |  | 2010
Beginning balance |  | $ | 4,978 |  |  | $ | 4,411 |  |  | $ | 5,306 |
Increases (decreases) to prior year tax positions |  | 156 |  |  | 494 |  |  | (649 | )
Increases to current year tax positions |  | 490 |  |  | 764 |  |  | 518 |
Decrease related to settlements |  | (230 | ) |  | (392 | ) |  | (764 | )
Decrease related to lapse of statute of limitations |  | (1,158 | ) |  | (299 | ) |  | — |
Ending balance |  | $ | 4,236 |  |  | $ | 4,978 |  |  | $ | 4,411 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: 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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- Definition Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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