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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
Income Taxes [Abstract] |
Income before income taxes |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Domestic |  | $ | 23,480 |  |  | $ | 35,371 |  |  | $ | 33,964 |
Foreign |  |  | 8,030 |  |  |  | 3,274 |  |  |  | 336 |
Total |  | $ | 31,510 |  |  | $ | 38,645 |  |  | $ | 34,300 |
Components of the income tax provision |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 11,945 |  |  | $ | (1,083 | ) |  | $ | 8,722 |
State |  |  | 3,038 |  |  |  | 738 |  |  |  | 1,571 |
Foreign |  |  | 1,338 |  |  |  | 843 |  |  |  | 1,144 |
Total current |  |  | 16,321 |  |  |  | 498 |  |  |  | 11,437 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (4,449 | ) |  |  | 13,485 |  |  |  | 2,301 |
State |  |  | (736 | ) |  |  | 1,186 |  |  |  | 1,025 |
Foreign |  |  | (5,200 | ) |  |  | 466 |  |  |  | (970 | )
Total deferred |  |  | (10,385 | ) |  |  | 15,137 |  |  |  | 2,356 |
Income tax provision |  | $ | 5,936 |  |  | $ | 15,635 |  |  | $ | 13,793 |
Reconciliation of the federal statutory rate |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Income tax provision at federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
Increase (decrease) in tax resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State tax provision, net of federal benefit |  |  | 4.9 |  |  |  | 3.1 |  |  |  | 5.0 |
Non-deductible expenses |  |  | 0.4 |  |  |  | 1.6 |  |  |  | 2.2 |
Tax-exempt interest income |  |  | (0.5 | ) |  |  | (0.4 | ) |  |  | (1.3 | )
Stock option compensation deduction |  |  | 0.7 |  |  |  | 0.6 |  |  |  | 0.2 |
Change in valuation allowance |  |  | (0.8 | ) |  |  | 1.1 |  |  |  | (3.4 | )
Exchange rate gain |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  | (1.1 | )
Foreign tax rate differential |  |  | (2.8 | ) |  |  | (1.0 | ) |  |  | — |
Benefit upon audit settlement |  |  | (19.6 | ) |  |  | — |  |  |  | — |
Other, net |  |  | 1.8 |  |  |  | 1.0 |  |  |  | 3.6 |
Effective tax rate |  |  | 18.8 | % |  |  | 40.5 | % |  |  | 40.2 | %
Components of deferred income taxes |
|  | 2012 |  |  | 2011 |
Non-deductible reserves and accruals |  | $ | 4,105 |  |  | $ | 3,125 |
Stock compensation |  |  | 4,948 |  |  |  | 5,146 |
Net operating loss and other carryforwards |  |  | 9,816 |  |  |  | 7,526 |
Gross deferred tax asset |  |  | 18,869 |  |  |  | 15,797 |
Less—valuation allowance |  |  | (2,086 | ) |  |  | (3,077 | )
Sub-total |  |  | 16,783 |  |  |  | 12,720 |
Depreciation and amortization |  |  | (5,018 | ) |  |  | (7,996 | )
Goodwill amortization |  |  | (4,381 | ) |  |  | (5,518 | )
Other liabilities |  |  | (2,872 | ) |  |  | (3,347 | )
Deferred commissions |  |  | (3,743 | ) |  |  | (4,775 | )
Net deferred tax asset (liability) |  | $ | 769 |  |  | $ | (8,916 | )
Summary of changes in deferred tax valuation allowance |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Deferred tax valuation allowance at January 1 |  | $ | 3,077 |  |  | $ | 2,676 |  |  | $ | 11,672 |
Additions |  |  | 11 |  |  |  | 508 |  |  |  | 440 |
Deductions |  |  | (1,066 | ) |  |  | (85 | ) |  |  | (9,405 | )
Translation adjustments |  |  | 64 |  |  |  | (22 | ) |  |  | (31 | )
Deferred tax valuation allowance at December 31 |  | $ | 2,086 |  |  | $ | 3,077 |  |  | $ | 2,676 |
Reconciliation of unrecognized tax benefits |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Unrecognized tax benefits at January 1 |  | $ | 1,269 |  |  | $ | 1,222 |  |  | $ | 919 |
Additions for tax positions of prior years |  |  | 112 |  |  |  | 107 |  |  |  | 410 |
Reductions for tax positions of prior years |  |  | (37 | ) |  |  | — |  |  |  | — |
Additions for tax positions of current year |  |  | 1,271 |  |  |  | 17 |  |  |  | 77 |
Settlements |  |  | (582 | ) |  |  | — |  |  |  | — |
Lapse of statute of limitations |  |  | (360 | ) |  |  | (77 | ) |  |  | (184 | )
Translation adjustments |  |  | (2 | ) |  |  | — |  |  |  | — |
Unrecognized tax benefits at December 31 |  | $ | 1,671 |  |  | $ | 1,269 |  |  | $ | 1,222 |

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