Stock-Based Compensation (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Stock-Based Compensation Details
Shares available to be issued under the 2011 Plan	2,200,000
Options exercised period	10 years
Common stock issued as compensation to directors, shares	42,225
Common stock issued as compensation to directors	$ 42,000
Outstanding at the beginning of period (in shares)	50,900
Options forfeited (in shares)	(11,392)
Outstanding at the end of period (in shares)	39,508
Outstanding at the beginning of period	$ 34.31
Options forfeited	$ 32.97
Outstanding at the end of period	$ 34.70
Weighted- Average Remaining Contractual Term	2.3 years
Aggregate Intrinsic Value	$ 0