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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Contingency [Line Items] |  |  |
Domestic | $ 34,678,000 | $ 25,794,000 | $ 16,177,000
Foreign | 351,000 | 1,281,000 | (88,000)
Income before provision for income taxes | 35,029,000 | 27,075,000 | 16,089,000
Current: |  |  |
Federal | 8,218,000 | 7,181,000 | 4,285,000
State | 1,621,000 | 1,006,000 | 896,000
Foreign | 447,000 | 154,000 | (70,000)
Total current | 10,286,000 | 8,341,000 | 5,111,000
Deferred: |  |  |
Federal | 1,287,000 | 2,169,000 | 1,116,000
State | (263,000) | 651,000 | (527,000)
Foreign | (260,000) | (264,000) | 0
Total deferred | 764,000 | 2,556,000 | 589,000
Provision for income taxes | 11,050,000 | 10,897,000 | 5,700,000
Income Tax Reconciliation: |  |  |
U.S. federal tax provision at statutory rate | 12,260,000 | 9,476,000 | 5,631,000
State taxes | 883,000 | 1,077,000 | 240,000
Non-deductible expenses | 297,000 | 530,000 | 481,000
Acquisition costs | 0 | 431,000 | 0
Share-based compensation expense | 407,000 | 403,000 | 443,000
Research tax credits | (1,430,000) | 0 | (755,000)
Domestic production deduction | (816,000) | (601,000) | (271,000)
Other | (551,000) | (419,000) | (69,000)
Provision for income taxes | 11,050,000 | 10,897,000 | 5,700,000
Components of Deferred Tax Assets and Liabilities: |  |  |
Deferred Tax Assets, Tax Credit Carryforwards | 3,160,000 | 2,990,000 |
Deferred Tax Assets, Inventory related items | 2,947,000 | 2,900,000 |
Deferred Tax Assets, Deferred revenue | 11,074,000 | 11,497,000 |
Deferred Tax Assets, Stock compensation | 7,447,000 | 9,331,000 |
Deferred Tax Assets, Loss carry forwards | 64,000 | 53,000 |
Deferred Tax Assets, Other net | 5,000 | 69,000 |
Deferred Tax Assets, Gross | 24,697,000 | 26,840,000 |
Deferred Tax Assets, Valuation Allowance | (39,000) | (39,000) |
Deferred Tax Assets, Net of Valuation Allowance | 24,658,000 | 26,801,000 |
Deferred Tax Liabilities, Reserves and accruals | (353,000) | (573,000) |
Deferred Tax Liabilities, Depreciation and amortization | (38,681,000) | (39,840,000) |
Deferred Tax Liabilities, Gross | (39,034,000) | (40,413,000) |
Deferred Tax Liabilities, Net | 14,376,000 | 13,612,000 |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized Tax Benefits | 6,915,000 | 5,796,000 | 5,431,000
Increases related to tax positions taken during a prior period | 406,000 | 43,000 |
Increases related to tax positions related to MTS |  | 1,066,000 |
Decreases related to tax positions taken during the prior period | (79,000) |  | (88,000)
Increases related to tax positions taken during the current period | 764,000 | 422,000 | 453,000
Decreases related to settlements |  | (33,000) |
Decreases related to expiration of statute of limitations | (32,000) | (379,000) |
Unrecognized Tax Benefits | 7,974,000 | 6,915,000 | 5,796,000
Tax effected amounts of gross unrealized net operating loss and business tax credit carry forwards excluded under ASC 718 | 2,600,000 |  |
Undistributed Earnings of Foreign Subsidiaries | 2,800,000 |  |
Unrecognized tax benefits that would affect tax expense | 7,000,000 |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 1,100,000 |  |
State and Local Jurisdiction [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Operating Loss Carryforwards | 2,200,000 |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Tax Credit Carryforward, Amount | 7,200,000 |  |
Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Tax Credit Carryforward, Amount | $ 1,500,000 |  |

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