CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Series A Preferred Stock [Member], USD $)	12 Months Ended
Dec. 31, 2012
Series A Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend declared on Series A preferred stock (in dollars per share)	$ 0.16

Aggregate dividends declared during the period for each share of preferred stock outstanding.

No definition available.

Name:	us-gaap_PreferredStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration