Share-Based Compensation (Details) (USD $)	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Stock Options
Number of shares
Outstanding at the beginning of the period (in shares)	370,207
Granted (in shares)	28,224
Exercised (in shares)	(36,681)
Expired/Forfeited (in shares)	(6,404)
Outstanding at the end of the period (in shares)	355,346
Exercisable at the end of the period (in shares)	283,147
Weighted-average fair value of options granted during the year (in dollars per share)	$ 11.55
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 30.69
Granted (in dollars per share)	$ 31.75
Exercised (in dollars per share)	$ 24.54
Expired/Forfeited (in dollars per share)	$ 31.17
Outstanding at the end of the period (in dollars per share)	$ 31.40
Exercisable at the end of the period (in dollars per share)	$ 31.25
Weighted-Average Remaining Contractual Life (Yrs.)
Outstanding at the end of the period (in years)	4 years 8 months 26 days
Exercisable at the end of the period (in years)	3 years 10 months 13 days
Aggregate Intrinsic Value (000's)
Outstanding at the end of the period	$ 3,159,000
Exercisable at the end of the period	2,559,000
Weighted-average assumptions
Dividend yield (as a percent)	2.10%	2.20%
Expected life (in years)	6 years	6 years
Expected volatility (as a percent)	46.00%	44.00%
Risk-free interest rate (as a percent)	1.06%	2.32%
Additional disclosures
Total unrecognized compensation cost related to nonvested stock option grants	619,000
Weighted-average period over which unrecognized compensation cost is expected to be recognized (in years)	1 year 3 months 4 days
Total fair value of shares vested during the period	402,000
Incentive stock options
Share-Based Compensation
Vesting percentage	25.00%
Vesting period	4 years
Expiration period (in years)	10 years
Restricted Stock
Additional disclosures
Weighted-average period over which unrecognized compensation cost is expected to be recognized (in years)	3 years 10 months 20 days
Restricted Stock Activity
Nonvested at the beginning of the period (in shares)	171,704
Granted (in shares)	47,666
Vested (in shares)	(34,187)
Forfeited (in shares)	(4,992)
Nonvested at the end of the period (in shares)	180,191
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 30.32
Granted (in dollars per share)	$ 32.27
Vested (in dollars per share)	$ 30.30
Forfeited (in dollars per share)	$ 32.03
Nonvested at the end of the period (in dollars per share)	$ 30.80
Additional disclosures
Total unrecognized compensation cost related to nonvested restricted stock granted	3,900,000
Total fair value of restricted shares vested during the period	$ 1,000,000
Restricted Stock \| Employees \| Minimum
Share-Based Compensation
Vesting period	4 years
Additional disclosures
Cliff vesting period on certain occasion	7 years
Restricted Stock \| Employees \| Maximum
Additional disclosures
Cliff vesting period on certain occasion	10 years
Restricted Stock \| Non-employee directors \| Maximum
Additional disclosures
Cliff vesting period on certain occasion	12 months
2012 plan
Share-Based Compensation
Number of shares registered under the 2012 plan	1,684,000
2012 plan \| Restricted Stock \| Maximum
Share-Based Compensation
Number of shares registered under the 2012 plan	817,476

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The period of time, from the grant date until the time at which the share-based (option) award expires.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, shown as a percentage.

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Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

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

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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).

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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.

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

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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 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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration