Stockholders' Equity (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-Based Compensation (Textual) [Abstract]
Stock options, Outstanding, Aggregate Intrinsic Value	$ 3,391,000
Stock options, Exercisable, Aggregate Intrinsic Value	1,032,000
Stock options, Exercisable, Number of Options	290,911
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.52
Stock options, Exercisable, Weighted Average Remaining Contractual Life	1 year 9 months 11 days
Stock options, Outstanding, Weighted Average Remaining Contractual Life	3 years 3 months 11 days
Stock options [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock award, vesting period	4 years
Stock award, exercise period	5 years
Awards other than options, decrease in number of shares reserved for issuance	2
Common stock, shares reserved for issuance	7,165,000
Options and award to purchase shares of common stock, issued or expired (in shares)	6,028,661
Number of shares available for future grants	1,136,339
Weighted-average fair value per share, options granted (in dollars per share)	$ 4.97	$ 6.36	$ 6.54
Stock options, total intrinsic value of options exercised	173,000	183,000	1,157,000
Stock options, Outstanding, Aggregate Intrinsic Value		112,000	1,254,000
Stock options, Exercisable, Aggregate Intrinsic Value		85,000	851,000
Stock options, Exercisable, Number of Options		361,994	416,710
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share)		$ 9.36	$ 10.06
Stock options, Exercisable, Weighted Average Remaining Contractual Life		1 year 2 months 5 days	1 year 5 months 8 days
Stock options, Outstanding, Weighted Average Remaining Contractual Life		2 years 7 months 17 days	2 years 3 months 11 days
Unrecognized compensation expense	2,913,000
Weighted-average period of recognition (in years)	2 years 9 months 28 days
Allocated Share-based Compensation Expense	1,130,000	709,000	514,000
Cash received under stock option plans for exercises	689,000	652,000	3,685,000
Restricted stock [Member]
Stock-Based Compensation (Textual) [Abstract]
Unrecognized compensation expense	2,448,000
Weighted-average period of recognition (in years)	1 year 1 month 28 days
Allocated Share-based Compensation Expense	2,495,000	2,728,000	1,942,000
Granted (in shares)	43,340	167,500	324,321
Restricted stock, Granted, Weighted-average grant date fair value (in dollars per share)	$ 12.53	$ 13.29	$ 13.12
Employee stock purchase plan [Member]
Stock-Based Compensation (Textual) [Abstract]
Number of shares available for future grants	36,100
Allocated Share-based Compensation Expense	54,000	96,000	68,000
Employee stock purchase plan, number of shares authorized	600,000
Percentage of Company's common stock share price	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	27,308	38,718	21,654
Employee stock purchase plan, discount percentage attributable to compensation expense	15.00%
Cash received under the employee stock purchase plan	$ 270,000	$ 289,000	$ 260,000
Employee stock purchase plan [Member] \| Maximum
Stock-Based Compensation (Textual) [Abstract]
Employee election percentage of pre-tax compensation withheld to purchase Company's common stock shares	6.00%

Share-Based Compensation Arrangement By Share Based Payment Award, Award Exercise Period

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Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Awards, Pre-Tax Contibution Percentage Of Compensation

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Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instrument, Discount Percentage Attributable to Compensation Expense

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Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instrument, Percentage Of Share Price

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Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Reduction Of Number of Shares Reserved For Issuance

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Share-Based Compensation Arrangement by Share-Based Payment Award, Options and Non-Option Equity Instruments, Shares Issued Or Expired

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share instruments newly issued under a share-based compensation plan.

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