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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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Restricted stock grants	Sep. 30, 2012 Restricted stock grants	Sep. 30, 2013 Restricted stock grants	Sep. 30, 2012 Restricted stock grants	Sep. 30, 2013 Restricted stock units	Sep. 30, 2012 Restricted stock units	Sep. 30, 2013 Restricted stock units	Sep. 30, 2012 Restricted stock units	Sep. 30, 2013 2012 Incentive Plan	Sep. 30, 2013 Prior Incentive Plans	Sep. 30, 2013 Pay-for-performance program	Sep. 14, 2010 Pay-for-performance program Restricted stock units	Sep. 30, 2013 Pay-for-performance program Restricted stock units
Stock Based Compensation
Number of shares authorized for issuance													600,000
Shares issued pursuant to plan													112,650
Vesting period							5 years
Number of share instruments vested since plan's inception													50
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
Summary of the activity of the incentive plans
Restricted share grants							112,650	109,450								200,000
Average per share grant price (in dollars per share)							$ 21.59	$ 16.77
Deferred compensation to be recognized over vesting period							$ 2,432,000	$ 1,835,000
Non-vested shares:
Non-vested beginning of period (in shares)					470,015	408,510	407,460	348,385						557,415
Grants (in shares)							112,650	109,450								200,000
Vested during period (in shares)							(50,095)	(49,325)									0
Forfeitures (in shares)						(1,050)		(1,050)									0
Non-vested end of period (in shares)					470,015	407,460	470,015	407,460						557,415
Other disclosures
Average per share value of non-vested shares (based on grant price) (in dollars per share)					$ 14.22	$ 12.59	$ 14.22	$ 12.59
Value of shares vested during the period (based on grant price)							876,000	1,208,000
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:
Share based compensation charged to operations	366,000	323,000	1,132,000	909,000	335,000	250,000	1,037,000	792,000	31,000	73,000	95,000	117,000
Compensation costs related to nonvested awards that have not yet been recognized	$ 4,580,000		$ 4,580,000												$ 459,000
Approximate weighted average vesting period			2 years 9 months 18 days

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