Subsequent Events	12 Months Ended
Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	(21) Subsequent Events On January 26, 2012, the board of directors declared a $0.24 per share dividend to shareholders of record as of February 8, 2012, which was paid on February 15, 2012.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

No definition available.

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration