Share-based Compensation (Nonvested Restricted Stock) (Details) (USD $)	12 Months Ended
Dec. 31, 2012 Installment	Dec. 31, 2011	Dec. 31, 2010
Nonvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Common shares reserved for stock option and restricted stock grants	5,800,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rate, initial year (percent)	33.33%
Quarterly award vesting installments after initial year	8
Nonvested Awards, Number of Shares [Roll Forward]
Nonvested awards, Shares, beginning balance	145,081	210,285	405,312
Nonvested awards, Shares Granted	73,061	103,469	50,371
Nonvested awards, Shares Vested	(90,379)	(150,267)	(241,215)
Nonvested awards, Shares Forfeited	(6,607)	(18,406)	(4,183)
Nonvested awards, Shares, ending balance	121,156	145,081	210,285
Nonvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested awards outstanding, Weighted Average Grant Date Fair Value, beginning balance (in dollars per share)	$ 20.13	$ 9.98	$ 7.79
Nonvested awards, Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 23.26	$ 23.33	$ 16.05
Nonvested awards, Vested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 18.89	$ 9.51	$ 7.59
Nonvested awards, Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	$ 24.10	$ 8.79	$ 8.22
Nonvested awards outstanding, Weighted Average Grant Date Fair Value, ending balance (in dollars per share)	$ 22.74	$ 20.13	$ 9.98
Unrecognized compensation cost, share-based compensation arrangements	$ 2,200,000
Weighted average period to recognize nonvested awards (in years)	1 year 9 months 18 days
Fair value of shares vested during period	1,700,000	1,400,000	1,800,000
Stock compensation expense recognized on restricted grants	$ 1,500,000	$ 1,700,000	$ 1,400,000

Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Life

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rate

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Share-based Compensation Arrangements by Share-based Payment Award, Award Vesting Installments

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Stocks Issued During Period, Shares, Restricted Stock Award, Vested

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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.

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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 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.

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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