Share Buyback Program (Details) shares in Thousands	9 Months Ended
Sep. 30, 2018 Program shares	Nov. 26, 2008 shares
Share Buyback Program (Textual) [Abstract]
Common stock available for repurchase \| shares	341	1,000
Number of other repurchase programs outstanding	0
Number of stock repurchase programs other expired	0

The 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_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant