Employee Benefit Plans (Restricted Shares Granted) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Grant Share Amount A [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant	Jan. 02, 2013	[1]
Restricted share grants, Shares	89,329	[1]
Restricted share grants, Market Value Per Share	$ 20.64	[1]
Restricted share grants, vesting percentage	33.00%	[1]
Restricted share grants Vesting Period, in years	3 years	[1]
Grant Share Amount B [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant	Jan. 02, 2013	[2]
Restricted share grants, Shares	89,329	[2]
Restricted share grants, Market Value Per Share	$ 30.96	[2]
Restricted share grants, vesting percentage	100.00%	[2]
Restricted stock, vesting date	Jan. 01, 2016	[2]
Grant Share Amount C [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant	Jan. 02, 2013	[3]
Restricted share grants, Shares	1,620	[3]
Restricted share grants, Market Value Per Share	$ 20.64	[3]
Restricted share grants, vesting percentage	100.00%	[3]
Restricted stock, vesting date	Jan. 01, 2015	[3]
Maximum [Member] | Grant Share Amount B [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Maximum award percentage	200.00%

[1] Reflects the grant of restricted shares to our executive officers.

[2] Reflects the grant of performance share units (“PSUs”) to our executive officers. The estimated fair value of the PSUs on grant date was determined using a Monte Carlo simulation model. The PSUs provide for an award based on the performance of our common stock over a three-year period with the maximum award being 200% of the original awarded PSUs and the minimum amount being zero. The vested PSUs will be settled in an equivalent number of shares of our common stock unless the Compensation Committee of our Board of Directors elects to pay in cash.

[3] Reflects the grant of restricted shares to one of our directors.