Amount of grant date fair value expensed immediately for awards granted to retirement-eligible grantees.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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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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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 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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- Definition

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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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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No definition available.

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Net 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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of grant-date fair value expensed immediately for awards granted to retirement-eligible grantees	$ 1,926	$ 1,358
Purchase of treasury stock, shares	216,700	204,574
Purchase of treasury stock, aggregate cost basis	$ 5,412	$ 3,781	$ 4,009
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	28,240
Grant-date fair value	$ 7.79
Stock options expected term	5 years 6 months
Stock options expected volatility	30.80%
Stock options risk-free interest rate	1.71%
Stock options expected dividend yield	0.00%
Exercise price of options	$ 24.62
Unrecognized compensation cost	$ 2,053
Weighted-average period of unrecognized compensation cost expected to be recognized	25 months
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	826,718
Grant-date fair value	$ 24.62
Unrecognized compensation cost	$ 26,949
Weighted-average period of unrecognized compensation cost expected to be recognized	30 months
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	627,385
Grant-date fair value	$ 32.14
Unrecognized compensation cost	$ 22,114
Weighted-average period of unrecognized compensation cost expected to be recognized	28 months