Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Accretion of issuance cost of preferred dividends	$ 118	$ 3,952	$ 236	$ 4,253

Name:

us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment

Namespace Prefix:

us-gaap

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration