Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Common Stock Plans (Stock Repurchase Program) (Details) (Common Stock, USD $)	0 Months Ended	12 Months Ended
	May 25, 1994	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 12,564,400
Stock repurchase program, remaining authorized repurchase amount		$ 8,992,700
Shares acquired in connection with stock compensation plans		14,766	5,459	12,867