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Stock Options, Restricted Stock and Restricted Stock Units (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Feb. 28, 2014 Board of Directors [Member]	Apr. 30, 2011 1996 Equity Compensation Plan [Member]	Apr. 30, 2011 2011 Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant				350,000	300,000
Shares approved for grants			46,064
Vesting percentage			100.00%
Vesting date			Feb. 28, 2018
Closing price of stock on date of stock grant			$ 33.65
Maximum term of the awards granted under the Plan	10 years
Stock-based compensation cost which has not yet been recognized	$ 33.3
Stock-based compensation cost recognized period, in months	50 months
Tax shortfall related to share-based payment arrangements	$ 1.6	$ 3.3
Restricted stock awarded subject to performance condition	351,000
Number of stock options, exercised

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Closing price of stock on date of stock grant.

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Excess tax shortfall resulting from increases in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return does not exceed compensation cot from equity based compensation recognized in financial statements. Excess tax benefits resulting from decreases in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements.

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Maximum term of the awards granted under the plan.

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Restricted stock awarded subject to performance condition.

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Share based compensation arrangement by share based payment award award vesting date.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB

-Name Accounting Standards Codification

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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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Percentage of vesting of share-based compensation awards.

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

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