Earnings Per Share (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share (Textual) [Abstract]
Cash distributions to stockholders	$ 0	$ 0

The amount of cash distributions paid to a common shareholder or unit-holder by a LLC or LP.

No definition available.

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