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Treasury Stock and Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract]
Average remaining contractual life of options outstanding	3
Fair value of restricted stock granted	$ 21.63
Compensation expense recognition period (in years)	3
Number of hypothetical shares of common stock	152,955
Fourth anniversary of grant date	Mar. 31, 2015
Number of Restricted Stock Units Forfeited	0
Compensation expense	$ 781	$ 698
Actual cumulative forfeitures (in units)	19,918
Assumed maximum IRR for all grants	12.50%
Tax benefit recognized on vested shares	1,067
Treasury Stock and Share Based Awards (Textual) [Abstract]
Market value of restricted shares withheld minimum	$ 21.95
Market value of restricted shares withheld maximum	$ 22.40
Intrinsic value of options exercised	3
Shares of Restricted Stock Granted	618,230
Minimum forfeiture rate for restricted stock awards	0.00%
Maximum forfeiture rate for restricted stock awards	5.00%
Total fair value of vested shares	7,636
Tax benefit recognized on vested shares	1,067
Unrecognized Compensation expense related to restricted stock awards	24,996
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	2,534	1,315
Number of restricted units vested during period	113,456
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract]
Fair value of restricted stock granted	$ 21.63
Award vesting period range for remaining restricted stock granted	Over 4 Years
Award vesting period range for restricted stock granted	Over 3 years
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract]
Unrecognized Compensation expense related to outstanding stock options	6,153
Compensation expense recognition period (in years)	2
Number of hypothetical shares of common stock	1,077,269
Total dividend paid	346
Fair value of the restricted stock unit awards, vested	2,541
Tax benefit recognized on vested shares	2,863
Treasury Stock and Share Based Awards (Textual) [Abstract]
Tax benefit recognized on vested shares	$ 2,863
at IRR of at least 8.5% [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract]
Percentage of restricted stock units vest	33.00%
at IRR of at least 10.5% [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract]
Percentage of restricted stock units vest	66.00%
at IRR of at least 12.5% [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract]
Percentage of restricted stock units vest	100.00%

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-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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-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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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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-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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