Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option expense	$ 408	$ 316
Weighted-average fair value per share (in dollars per share)	$ 6.55
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	2,264,399
Granted (in shares)	10,000	0
Exercised (in shares)	(114,599)
Forfeited or expired (in shares)	(2,950)
Outstanding, ending balance (in shares)	2,156,850
Options exercisable (in shares)	1,143,074
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 7.02
Granted (in dollars per share)	$ 11.44
Exercised (in dollars per share)	$ 5.40
Forfeited or expired (in dollars per share)	$ 10.42
Outstanding, ending balance (in dollars per share)	$ 7.13
Exercisable, ending balance (in dollars per share)	$ 6.16
Aggregate intrinsic value exercised	766	33
Aggregate intrinsic value outstanding	12,308
Aggregate intrinsic value exercisable	7,672
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense	22	41
Weighted average vesting period	2 months 12 days
Nonvested Restricted Stock Number of Shares [Roll Forward]
Nonvested, beginning balance (in shares)	31,145
Granted (in shares)	0
Vested during period (in shares)	(29,450)
Forfeited (in shares)	0
Nonvested, ending balance (in shares)	1,695
Nonvested Restricted Stock, Weighted-Average Grant-Date Fair Value [Roll Forward]
Nonvested, beginning balance (in dollars per share)	$ 5.76
Granted (in dollars per share)	$ 0
Vested during period (in dollars per share)	$ 5.54
Forfeited (in dollars per share)	$ 0
Nonvested, ending balance (in dollars per share)	$ 9.64
Compensation cost and weighted average vesting period information [Line Items]
Total compensation cost related to unvested share-based awards not yet recognized	5
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Performance Shares [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share expense	63	0
Cash Settled Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Cash Settled Performance Share Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share unit expense	541	(24)
Nonvested Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average vesting period	2 years 6 months
Compensation cost and weighted average vesting period information [Line Items]
Total compensation cost related to unvested share-based awards not yet recognized	$ 3,972
Nonvested Stock Options, Number of Shares [Roll Forward]
Nonvested, beginning balance (in shares)	1,029,776
Granted (in shares)	10,000
Vested during period (in shares)	(25,000)
Forfeited (in shares)	(1,000)
Nonvested, ending balance (in shares)	1,013,776
Nonvested Stock Options, Weighted-Average Grant-Date Fair Value [Roll Forward]
Nonvested, beginning balance (in dollars per share)	$ 4.62
Granted (in dollars per share)	$ 6.55
Vested during period (in dollars per share)	$ 2.69
Forfeited (in dollars per share)	$ 3.39
Nonvested, ending balance (in dollars per share)	$ 4.69

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The total expense related to cash settled performance shares.

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The number of nonvested shares under options that were granted during the reporting period as specified in contractual agreements pertaining to the stock option plan.

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The number of nonvested shares under options that were vested during the reporting period as specified in contractual agreements pertaining to the stock option plan.

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The number of nonvested stock options that are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on stock option plans.

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Weighted average fair value as of the grant date of stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value as of the grant date of the stock (unit) option plans that were granted during the reporting period as specified in contractual agreements pertaining to the stock option plan.

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The weighted average fair value as of grant date pertaining to stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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 noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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