Equity (Details 3) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Remaining compensation expense to be recognized related to the future service period of unvested outstanding stock options
2014	$ 11,000
2015	15,000
2016	15,000
2017	2,000
Stock Options
Stock Based Compensation Plans
Number of shares exercised	10,000	22,000
Value of options exercised	238,000	523,000
Market value on the date of exercise	390,000	865,000
Options Granted	15,000
Exercise price (in dollars per share)	$ 38.43
Stock options granted (in shares)		0
Options outstanding at end of the period (in shares)	78,334
Options exercisable at end of the period (in shares)	63,334
Compensation expense	1,000
Vesting period	3 years
Stock Options \| Vesting through December 31, 2014
Stock Based Compensation Plans
Options scheduled to vest (in shares)	0
Stock Options \| Vesting through December 31, 2015
Stock Based Compensation Plans
Options scheduled to vest (in shares)	5,000
Stock Options \| Vesting through December 31, 2016
Stock Based Compensation Plans
Options scheduled to vest (in shares)	5,000
Stock Options \| Vesting through December 31, 2017
Stock Based Compensation Plans
Options scheduled to vest (in shares)	5,000
Stock Options \| Vesting beyond 2017
Stock Based Compensation Plans
Options scheduled to vest (in shares)	0
Restricted stock
Stock Based Compensation Plans
Compensation expense	665,000	985,000
Shares vested due to retirement of former SVP Marketing and Strategic Planning		18,180
Compensation expense related to the accelerated vesting		$ 457,000
Restricted stock \| $ 36.26 per share grant price \| Vesting on June 1, 2016
Stock Based Compensation Plans
Granted (in shares)		20,000
Price per share		$ 36.26
Restricted stock \| $ 36.81 per share grant price
Stock Based Compensation Plans
Granted (in shares)	59,000
Vesting period	3 years
Price per share	$ 36.81
Restricted stock \| $ 38.43 per share grant price
Stock Based Compensation Plans
Granted (in shares)	3,000
Vesting period	3 years
Price per share	$ 38.43

Unrecognized cost of unvested share-based compensation awards in year four.

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Unrecognized cost of unvested share-based compensation awards in year one.

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Unrecognized cost of unvested share-based compensation awards in year three.

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Unrecognized cost of unvested share-based compensation awards in year two.

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- Definition

Represents the market value as of the exercise date of the common shares purchased during the period.

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No definition available.

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Represents the option value of the share options (or share units) exercised during the current period.

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No definition available.

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Represents the price of common stock at grant date used for awards under the share-based compensation plan.

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No definition available.

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- Definition

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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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Number of shares for which recognition of compensation cost was accelerated.

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No definition available.

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

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

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Number of options outstanding, including both vested and non-vested options.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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

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