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Stock Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended						0 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Restricted stock grants	Sep. 30, 2013 Restricted stock grants	Sep. 30, 2014 Restricted stock grants	Sep. 30, 2013 Restricted stock grants	Sep. 30, 2014 Restricted stock units	Sep. 30, 2013 Restricted stock units	Sep. 30, 2014 Restricted stock units	Sep. 30, 2013 Restricted stock units	Sep. 30, 2014 2012 Incentive Plan	Sep. 30, 2014 2012 Incentive Plan Restricted stock grants	Sep. 30, 2014 Prior Incentive Plans	Sep. 30, 2014 Pay-for-performance program	Sep. 14, 2010 Pay-for-performance program Restricted stock units	Sep. 30, 2014 Pay-for-performance program Restricted stock units
Stock Based Compensation
Number of shares authorized for issuance														600,000
Vesting period								5 years
Number of shares to be vested and issued for each unit outstanding on satisfying performance criteria at June 30, 2017																			1
Number of shares to be issued for each unit outstanding on not satisfying performance criteria at June 30, 2017																			0
Outstanding options at the end of the period (in shares)	0	0	0	0	0
Summary of the activity of the incentive plans
Restricted share grants								118,850	112,650									200,000
Per share grant price (in dollars per share)								$ 20.54	$ 21.59
Deferred compensation to be recognized over vesting period								$ 2,441,000	$ 2,432,000
Non-vested shares:
Non-vested beginning of period (in shares)						481,045	470,015	470,015	407,460						229,000	452,000
Grants (in shares)								118,850	112,650									200,000
Vested during period (in shares)								(101,300)	(50,095)										0
Forfeitures (in shares)						(50)		(6,570)											0
Non-vested end of period (in shares)						480,995	470,015	480,995	470,015						229,000	452,000
Other disclosures
Average per share value of non-vested shares (based on grant price) (in dollars per share)						$ 14.55	$ 14.22	$ 14.55	$ 14.22
Value of shares vested during the period (based on grant price)								621,000	876,000
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:
Share based compensation charged to operations	448,000	366,000	1,368,000	1,132,000		419,000	335,000	1,281,000	1,037,000	29,000	31,000	87,000	95,000
Compensation costs related to non-vested awards that have not yet been recognized	$ 5,293,000		$ 5,293,000														$ 315,000
Approximate weighted average vesting period			2 years 7 months 6 days

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Represents the number of shares to be vested and issued for each unit outstanding upon non satisfaction of the performance criteria.

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Represents the approximate weighted average vesting period for equity awards granted under the equity-based compensation arrangement.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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