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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | The following is a geographical breakdown of income before the provision for income taxes (in thousands):
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Domestic | $ | 34,678 |  |  | $ | 25,794 |  |  | $ | 16,177 |
Foreign | 351 |  |  | 1,281 |  |  | (88 | )
Total income before provision for income taxes | $ | 35,029 |  |  | $ | 27,075 |  |  | $ | 16,089 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The provision for income taxes consists of the following (in thousands):
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Current: |  |  |  |  |
Federal | $ | 8,218 |  |  | $ | 7,181 |  |  | $ | 4,285 |
State | 1,621 |  |  | 1,006 |  |  | 896 |
Foreign | 447 |  |  | 154 |  |  | (70 | )
Total current | 10,286 |  |  | 8,341 |  |  | 5,111 |
Deferred: |  |  |  |  |
Federal | 1,287 |  |  | 2,169 |  |  | 1,116 |
State | (263 | ) |  | 651 |  |  | (527 | )
Foreign | (260 | ) |  | (264 | ) |  | — |
Total deferred | 764 |  |  | 2,556 |  |  | 589 |
Total provision for income taxes | $ | 11,050 |  |  | $ | 10,897 |  |  | $ | 5,700 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The provision for income taxes differs from the amount computed by applying the statutory federal tax rate as follows (in thousands):
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
U.S. federal tax provision at statutory rate | $ | 12,260 |  |  | $ | 9,476 |  |  | $ | 5,631 |
State taxes | 883 |  |  | 1,077 |  |  | 240 |
Non-deductible expenses | 297 |  |  | 530 |  |  | 481 |
Acquisition costs | — |  |  | 431 |  |  | — |
Share-based compensation expense | 407 |  |  | 403 |  |  | 443 |
Research tax credits | (1,430 | ) |  | — |  |  | (755 | )
Domestic production deduction | (816 | ) |  | (601 | ) |  | (271 | )
Other | (551 | ) |  | (419 | ) |  | (69 | )
Total | $ | 11,050 |  |  | $ | 10,897 |  |  | $ | 5,700 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets (liabilities) are as follows (in thousands):
| December 31,
| 2013 |  | 2012
Deferred tax assets (liabilities): |  |  |
Tax credit carry forwards | $ | 3,160 |  |  | $ | 2,990 |
Inventory related items | 2,947 |  |  | 2,900 |
Deferred revenue | 11,074 |  |  | 11,497 |
Stock compensation | 7,447 |  |  | 9,331 |
Loss carry forwards | 64 |  |  | 53 |
Other, net | 5 |  |  | 69 |
Subtotal | 24,697 |  |  | 26,840 |
Less: valuation allowance | (39 | ) |  | (39 | )
Total net deferred tax assets | 24,658 |  |  | 26,801 |
Reserves and accruals | (353 | ) |  | (573 | )
Depreciation and amortization | (38,681 | ) |  | (39,840 | )
Total deferred tax liabilities | (39,034 | ) |  | (40,413 | )
Net deferred tax liabilities | $ | (14,376 | ) |  | $ | (13,612 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | he aggregate changes in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for the three years ended December 31, 2013 is as follows (in thousands):
Balance as of December 31, 2010 | $ | 5,431 |
Decreases related to tax positions taken during the prior period | (88 | )
Increases related to tax positions taken during the current period | 453 |
Balance as of December 31, 2011 | $ | 5,796 |
Increases related to tax positions taken during a prior period | 43 |
Increases related to tax positions related to MTS | 1,066
Increases related to tax positions taken during the current period | 422 |
Decreases related to settlements | (33 | )
Decreases related to expiration of statute of limitations | (379 | )
Balance as of December 31, 2012 | $ | 6,915 |
Increases related to tax positions taken during a prior period | 406
Decreases related to tax positions taken during the prior period | (79 | )
Increases related to tax positions taken during the current period | 764 |
Decreases related to expiration of statute of limitations | (32 | )
Balance as of December 31, 2013 | $ | 7,974 |

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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 the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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