Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	39,372,000	36,495,000
Common stock, shares outstanding	39,372,000	36,495,000
Number of shares redeemable upon settlement event (shares)	1,551,000	1,551,000
Series A [Member]
Preferred stock, per share liquidation value (usd per share)	$ 1,000	$ 1,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series B [Member]
Preferred stock, per share liquidation value (usd per share)	$ 29	$ 29
Preferred stock, shares issued	44,000	44,000
Preferred stock, shares outstanding	44,000	44,000
Series E [Member]
Preferred stock, per share redemption value	$ 10	$ 10
Preferred stock, shares issued	27,000	27,000
Preferred stock, shares outstanding	27,000	27,000
Preferred Stock, Liquidation Preference, Value	$ 29,859	$ 29,239