Equity-Based Compensation Plans (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Equity-Based Compensation Plans (Textual) [Abstract]
Equity-based compensation expense	$ 2,221,000	$ 1,813,000
Number of Options, Granted	735,500
Weighted average fair value of options granted	$ 5.07	$ 11.46
Expected volatility	60.00%	76.00%
Expected dividend yield	0.00%	0.00%
Contractual Life	3 years 9 months
Stock option grants in 2011 through 2014 [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Stock option vesting rights	three-year period
Stock option grants 2010 [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Stock option vesting rights	four-year period
Employee Stock Option Market vesting feature [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Number of Options, Granted	375,000
Expected volatility	63.00%
Risk-free interest rate	1.32%
Expected dividend yield	0.00%
Contractual Life	7 years
Employee Stock Option [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Intrinsic value of options	35,000	300,000
Unrecognized compensation expense	3,600,000	3,800,000
Compensation expense recognized over a weighted-average period	18 months
Fair Value of Vested Options	1,700,000
Performance Shares [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Requisite Service Period	3 years
Performance Cash Award [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Compensation expense recognized over a weighted-average period	2 years 2 months
Share-based Compensation Arrangement by Award Type, Performance Cash Award, Expense	1,000,000	700,000
Unrecognized compensation cost total	7,000,000
Restricted Stock Units R S U [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Number of shares of common stock available for issuance	650,000
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance	187,195
Stock & Deferred Compensation Plan for Non-Employee, Granted	19,642	16,404
Weighted-average fair value	$ 10.69	$ 10.97
Share units outstanding under the plan	352,418
Restricted Stock [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Compensation expense recognized over a weighted-average period	2 years 4 months	2 years 7 months
Unrecognized compensation cost total	8,100,000	7,500,000
Intrinsic Value of restricted stock awards	8,278,224
Employee Stock [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
ESPP under which the offering purchase price of shares	85.00%
Offering Period of Employee Stock Purchase Plan	3 months
Stock issued under ESPP	83,353	86,359
Company issued common stock under its ESPP	15.00%
Minimum [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Risk-free interest rate	0.46%	0.31%
Minimum [Member] \| Employee Stock Option Market vesting feature [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Weighted average fair value of options granted	$ 5.15
Minimum [Member] \| Restricted Stock [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Requisite Service Period	3 years
Maximum [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Risk-free interest rate	0.46%	0.35%
Maximum [Member] \| Employee Stock Option Market vesting feature [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Weighted average fair value of options granted	$ 5.88
Maximum [Member] \| Restricted Stock [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Stock option vesting Period	5 years
Selling General and Administrative Expenses [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Equity-based compensation expense	$ 2,200,000	$ 1,800,000
Market Vesting Feature Stock Price Threshold 1 [Member] \| Employee Stock Option Market vesting feature [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Share-based compensation arrangement by award type, market condition target	$ 14
Market Vesting Feature Stock Price Threshold 2 [Member] \| Employee Stock Option Market vesting feature [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Share-based compensation arrangement by award type, market condition target	$ 16
Market Vesting Feature Stock Price Threshold 3 [Member] \| Employee Stock Option Market vesting feature [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Share-based compensation arrangement by award type, market condition target	$ 18

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Share-based compensation arrangement by award type, market condition target

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Share-based Compensation Arrangement by Award Type, Performance Cash Award, Expense

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Share based compensation arrangement by share based payment award offering period of common stock.

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Share based compensation arrangement by share based payments award equity instruments other than options non vested intrinsic value.

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Stock and deferred compensation arrangement non employee director by share based payment award stock outstanding number.

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Aggregate number of common shares reserved for future issuance.

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Discount rate from fair value on offering date that participants pay for shares.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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