Treasury Stock and Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock granted	$ 21.63
Compensation expense recognition period (in years)	3 years
Treasury Stock and Share Based Awards (Textual) [Abstract]
Market value of restricted shares withheld minimum	$ 21.95
Market value of restricted shares withheld maximum	$ 22.50
Intrinsic value of options exercised	$ 3
Average remaining contractual life of options outstanding	2 years
Shares of restricted stock, granted	622,758
Minimum forfeiture rates for restricted stock awards	0.00%
Maximum forfeiture rates for restricted stock awards	5.00%
Total fair value of vested shares	9,938
Tax benefit recognized on vested shares	3,693
Unrecognized Compensation expense related to restricted stock awards	22,771
Compensation expense recognition period (in years)	3 years
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%
Minimum fair value of restricted stock granted	$ 21.63
Assumed forfeiture rate of restricted stock unit awards	5.00%
Compensation expense related to restricted stock awards	5,397	3,074
Number of restricted units vested during period	196,051
Actual cumulative forfeitures (in units)	11,608
Assumed maximum IRR for all grants	12.50%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock granted	$ 21.63
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock granted		$ 22.08
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total dividends paid on restricted stock units that vested during period	600
Fair value of the restricted stock unit awards, vested	4,400
Tax benefit recognized on vested restricted stock units	1,848
Restricted stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period range for restricted stock granted	4 years
Restricted stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period range for restricted stock granted	3 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of hypothetical shares of common stock, stock issued to employees	152,955
Number of hypothetical shares of common stock, stock issued at IRR level	994,674
Fourth anniversary of grant date	Mar. 31, 2015
Restricted stock unit awards forfeited in period	0
Unrecognized Compensation Expense for Outstanding Options	5,550
Compensation expense recognition period (in years)	2 years
Treasury Stock and Share Based Awards (Textual) [Abstract]
Compensation expense recognition period (in years)	2 years
Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to restricted units awards		1,498
Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to restricted units awards	$ 1,471

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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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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Cumulative restricted stock unit award forfeitures.

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

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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 awards.

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Fourth anniversary of grant date.

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Market value of restricted shares withheld maximum.

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Market value of restricted shares withheld minimum.

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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 grant date fair value per restricted stock unit granted.

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

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Number of hypothetical shares that could be issued if IRR level of at least 12.5% is reached for all grants for which restricted stock units are outstanding.

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Number of hypothetical shares of common stock issued to employees.

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Number of restricted stock units that vested during the period.

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- Definition

Amount of dividends paid on restricted stock units that vested during the period, which had accumulated since the award grant date.

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Value of restricted stock awards vested during the period.

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Restricted stock unit awards forfeited in period.

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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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Unrecognized compensation expense for outstanding options.

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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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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 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).

+ 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)(iii)(1)

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-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.

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)(c)

-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 total fair value of equity-based awards 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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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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