Stockholders' Equity, Stock Repurchase Program (Details)	Dec. 31, 2014	Apr. 27, 2005
Stock Repurchase Program [Abstract]
Stock repurchase program, number of shares authorized to be repurchased (in shares)		2,000,000
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares)	1,807,402

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant