Stock-based Compensation and Awards Summary of restricted stock activity (Details) (USD $)	6 Months Ended
Jun. 30, 2012
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of stock that vests on first anniversary date of the grant	33.3333%
Percent of stock that vests on second anniversary date of the grant	33.3333%
Percent of stock that vests on third anniversary date of grant	33.3334%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Granted	24,152
Weighted Average Grant Date Fair Value per Share, Granted	$ 12.42
Number of shares, Vested	0
Weighted Average Grant Date Fair Value per Share, Vested	$ 0
Number of shares, Forfeited	0
Weighted Average Grant Date Fair Value per Share, Forfeited	$ 0
Number of shares, Outstanding, Ending balance	24,152
Weighted Average Grant Date Fair Value per Share, Outstanding, Ending balance	$ 12.42
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Granted	253,810
Weighted Average Grant Date Fair Value per Share, Granted	$ 24.15
Number of shares, Vested	0
Number of shares, Forfeited	(500)
Weighted Average Grant Date Fair Value per Share, Forfeited	$ 24.15
Number of shares, Outstanding, Ending balance	253,310
Weighted Average Grant Date Fair Value per Share, Outstanding, Ending balance	$ 24.15
Director \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of stock that vests on first anniversary date of the grant	50.00%
Percent of stock that vests on second anniversary date of the grant	50.00%

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

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- Definition

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.

+ References

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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).

+ References

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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).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(2)(iii)(1)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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 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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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Award Vesting Percentage, Two Years from Grant Date

+ References

No definition available.

+ Details

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Vesting Percentage, One Year from Grant Date

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vesting Percentage, Three Years From Grant Date

+ References

No definition available.

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