Employee Benefit Plans (Restricted Shares Granted) (Details) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2013	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Shares	89,329	482,340		571,163	599,996
Restricted share grants, Market Value Per Share	$ 20.64
Performance Share Units Granted	89,329
Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Shares		132,910
Non Executive [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Shares		139,243
Grant Share Amount A [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Jan. 03, 2012	[1]
Restricted share grants, Shares		272,153
Restricted share grants, Market Value Per Share		15.80
Restricted share grants, vesting percentage		33.00%
Restricted share grants Vesting Period, in years		3 years
Grant Share Amount B [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Jan. 03, 2012	[2]
Restricted share grants, vesting percentage		100.00%
Restricted stock, vesting date		January 1, 2015
Performance Share Units Granted		132,910
Performance Share Unit Market Value		23.68
Grant Share Amount C [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Jan. 03, 2012	[3]
Restricted share grants, Shares		1,958
Restricted share grants, Market Value Per Share		15.80
Restricted share grants, vesting percentage		100.00%
Restricted stock, vesting date		January 1, 2014
Grant Share Amount D [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Apr. 01, 2012	[3]
Restricted share grants, Shares		1,879
Restricted share grants, Market Value Per Share		17.80
Restricted share grants, vesting percentage		100.00%
Restricted stock, vesting date		January 1, 2014
Grant Share Amount E [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Jul. 02, 2012	[3]
Restricted share grants, Shares		1,885
Restricted share grants, Market Value Per Share		16.41
Restricted share grants, vesting percentage		100.00%
Restricted stock, vesting date		January 1, 2014
Grant Share Amount F [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Aug. 23, 2012	[3]
Restricted share grants, Shares		3,539
Restricted share grants, Market Value Per Share		18.84
Restricted share grants, vesting percentage		20.00%
Restricted share grants Vesting Period, in years		5 years
Grant Share Amount G [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Oct. 01, 2012	[3]
Restricted share grants, Shares		1,830
Restricted share grants, Market Value Per Share		18.27
Restricted share grants, vesting percentage		100.00%
Restricted stock, vesting date		January 1, 2014
Grant Share Amount H [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share grants, Date of Grant		Dec. 06, 2012	[3]
Restricted share grants, Shares		66,186
Restricted share grants, Market Value Per Share		18.13
Restricted share grants, vesting percentage		33.00%
Restricted share grants Vesting Period, in years		3 years

[1] Reflects the grant of 132,910 restricted shares to our executive officers and 139,243 RSUs to selected management employees that are convertible into 139,243 shares of our common stock upon vesting. These RSUs may be settled in cash or common stock at the Company’s option.

[2] Reflects the grant of 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 grants to our directors.