Share-based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended			1 Months Ended			1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012 Restricted Stock	Sep. 30, 2012 Stock Options	Apr. 30, 2012 Selected Officers and Employees Restricted Stock	Sep. 30, 2012 Selected Officers and Employees Restricted Stock	Sep. 30, 2012 Selected Officers and Employees Restricted Stock Minimum	Sep. 30, 2012 Selected Officers and Employees Restricted Stock Maximum	Sep. 30, 2012 Selected Officers and Employees Stock Options	Apr. 30, 2012 Directors Restricted Stock	Sep. 30, 2012 Directors Restricted Stock	Sep. 30, 2012 Directors Stock Options	Jul. 31, 2010 Directors Common Stock	Sep. 30, 2012 Directors Common Stock	Sep. 30, 2012 Directors Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeiture rate (as a percentage)				4.00%			9.45%		2.00%	5.45%
Estimated annual forfeiture rate (as a percentage)				0.80%			1.89%		0.40%	1.09%
Unrecognized compensation costs	$ 1,534	$ 8
Unrecognized compensation costs, weighted-average period of recognition	4 years 5 months 12 days
Award vesting period					1 year	7 years		5 years
Shares granted			298,746					130,000
Commitment for future grants in April 2013 for selected non-management employees				81,900
Revised grants for selected non-management employees				48,100
Shares authorized for awards under plan								100,000
Shares available for grant under plan								82,200
Authorized shares to be reserved for issuance in lieu of cash											1,000,000
Minimum percentage of compensation allowed in shares											50.00%
Shares granted to directors in lieu of fees												5,994	23,156