Shareholders' Equity Share-based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based incentive plan, number of shares authorized for issuance	2,500,000
Share-based incentive plan, number of shares remaining for issuance	1,108,083
Total share-based compensation expense	$ 672	$ 489
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Granting and vesting of restricted stock	672	456
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Restricted stock outstanding at beginning of the period	520,969	448,283
Restricted stock granted during the period	428,363	139,600
Restricted stock vested during the period	(188,620)	(153,720)
Restricted stock outstanding at end of the period	760,712	434,163
Granting and vesting of restricted stock	3,453	1,491
Nonvested restricted stock, fair value remaining to be amortized	6,092
Restricted Stock [Member] \| Up to one year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Nonvested restricted stock, fair value remaining to be amortized	1,902
Restricted Stock [Member] \| Two to three years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Nonvested restricted stock, fair value remaining to be amortized	2,161
Restricted Stock [Member] \| Three to four years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Nonvested restricted stock, fair value remaining to be amortized	1,452
Restricted Stock [Member] \| Four to five years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Nonvested restricted stock, fair value remaining to be amortized	541
Restricted Stock [Member] \| Five years or more [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Nonvested restricted stock, fair value remaining to be amortized	$ 36

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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- Definition

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

+ References

No definition available.

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

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.

+ References

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-Publisher FASB

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- Definition

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

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- Definition

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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- Definition

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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- Definition

Aggregate value of stock related to Restricted Stock Awards issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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