Represents the expenses or credits recognized during the period arising from the forfeiture of 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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The aggregate 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 maximum vesting term over 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.

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The minimum vesting term over 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.

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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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Discloses use of the simplified method to calculate the expected term that stock option awards under the specified plan will exist before being exercised or terminated, the reason and justification for its use, and the periods for which the method was used if it was not used in all periods presented.

+ References

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

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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-Publisher FASB
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Long-Term Incentive Plan (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended
Long-Term Incentive Plan (Details) (USD $)	Jun. 30, 2011 Restricted Shares and Restricted Share Units	Jun. 30, 2010 Restricted Shares and Restricted Share Units	Jun. 30, 2011 Restricted Shares and Restricted Share Units	Jun. 30, 2010 Restricted Shares and Restricted Share Units	Apr. 30, 2008 Stock Options	Jun. 30, 2011 Stock Options
Long-Term Incentive Plan
Vesting period, minimum (in years)			one year
Vesting period, maximum (in years)			five years
Compensation expense and forfeitures related to these restricted shares and restricted share units
Compensation expense	$ 1,413,000	$ 1,022,000	$ 2,219,000	$ 2,326,000
Forfeiture expense adjustments	5,000	5,000	134,000	79,000
Stock options
Number of nonqualified stock options approved by the compensation committee of the Company's board of directors (in shares)					200,000
Exercise price of options vested (in dollars per share)						$ 17.71
Initial fair value of non-qualified stock options					$ 700,000
Estimated fair value of options and assumptions used for estimation
Expected dividend yield (as a percent)					7.90%
Risk-free interest rate (as a percent)					3.29%
Expected volatility (as a percent)					26.90%
Expected life (in years)					5.5 years