Treasury Stock and Share Based Awards (Textuals) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract]
Assumed forfeiture rate of restricted stock unit awards	5.00%
Number of hypothetical shares of common stock	153,727
Treasury Stock and Share Based Awards (Textuals) [Abstract]
Common Stock Repurchased Value As Result Of Restricted Stock Forfeitures	$ 0.001
Market Value Of Restricted Shares	$ 19.60
Intrinsic value of options exercised	$ 699
Recognized tax benefit on options exercised	238
Average remaining contractual life of options outstanding	3
Shares of Restricted Stock Granted	424,436
Minimum fair value of restricted stock granted	$ 19.35
Maximum fair value of restricted stock granted	$ 20.71
Minimum forfeiture rate for restricted stock awards	0.00%
Maximum forfeiture rate for restricted stock awards	5.00%
Award vesting period range for restricted stock granted to directors	Over one year
Award vesting period range for restricted stock granted to employees	4
Compensation expense related to restricted stock awards	3,074	2,134
Unrecognized Compensation expense related to restricted stock awards	17,205
Compensation expense recognition period (in years)	3
Total fair value of vested shares	5,658
Tax benefit recognized on vested shares	2,188
Market value of common stock on the date of grant	$ 19.35
Fourth anniversary of grant date	Mar. 31, 2015
Percentage of IRR, which is the threshold	8.50%
Percentage of IRR, which is the target	10.50%
Percentage of IRR, which is the maximum	12.50%
IRR Target Label One [Member]
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract]
Percentage of restricted stock units vest	33.00%
IRR Target Label Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract]
Percentage of restricted stock units vest	66.00%
IRR Target Label Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract]
Percentage of restricted stock units vest	100.00%
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract]
Number of Restricted Units Vested During Period	0
Shares of Restricted Stock Forfeited	0
Compensation expense	1,498	1,120
Actual cumulative forfeitures (in units)	19,918
Assumed maximum IRR for all grants	12.50%
Compensation expense recognition period (in years)	2
Unrecognized Compensation expense related to outstanding stock options	6,816
Number of hypothetical shares of common stock	1,037,770
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract]
Unrecognized Compensation expense related to outstanding stock options	$ 0

Assumed forfeiture rate of restricted stock unit awards granted during current period.

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Assumed IRR level for all restricted stock unit awards.

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Common Stock Repurchased Value As Result Of Restricted Stock Forfeitures

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Amount of compensation cost recognized during periods presented for outstanding restricted stock awards.

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Amount of compensation cost recognized during periods presented for outstanding restricted stock unit awards.

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The number of restricted stock unit awards forfeited on a cumulative basis.

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Tax benefit realized on restricted stock that vested during the period.

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Amount of unrecognized compensation cost for outstanding restricted stock unit awards.

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Period of time over which remaining unrecognized compensation costs related to outstanding restricted stock unit awards will be recognized.

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Fourth Anniversary Of Grant Date.

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Grant date fair value per share of restricted stock unit awards granted during period.

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Market value per share of restricted shares withheld by company related to restricted stock vesting

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Maximum forfeiture rate used for restricted stock awards granted during the period.

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Percentage of IRR, which is the maximum.

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Minimum forfeiture rate used for restricted stock awards granted during the period.

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Number of hypothetical shares granted during period assuming IRR level of at least 12.5%

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Number of restricted stock units that vested during the period.

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Percentage of restricted stock units vest.

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Number of restricted stock unit awards forfeited during the period.

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Number of restricted stock unit awards vested during the period.

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Vesting period for restricted stock awards granted to directors

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Vesting period for restricted stock awards granted to employees.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Maximum.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Minimum.

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Share-based Compensation Arrangement by Share-based Payment Award Textuals Abstract.

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Percentage of IRR, which is the target.

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Percentage of IRR, which is the threshold.

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Treasury Stock And Share Based Awards.

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Amount of unrecognized compensation expense related to options outstanding.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i

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The weighted average period over which unrecognized share-based compensation costs are expected to be reported.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph h

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The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(c)

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(2)

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The weighted average period between the balance-sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a

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