Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	150,000,000us-gaap_CommonStockSharesAuthorized	150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (shares)	36,495,000us-gaap_CommonStockSharesIssued	29,931,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (shares)	36,495,000us-gaap_CommonStockSharesOutstanding	29,931,000us-gaap_CommonStockSharesOutstanding
Series A [Member]
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, per share liquidation value (usd per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Series B [Member]
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, per share liquidation value (usd per share)	$ 29	$ 29
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	44,258	44,258
Preferred stock, shares outstanding (shares)	44,258	44,258
Series E [Member]
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, per share redemption value (usd per share)	$ 10	$ 10
Preferred stock, redemption shares (in shares)	1,551,000
Preferred stock, shares issued (shares)	27,000	1,731,000
Preferred stock, shares outstanding (shares)	27,000	1,731,000
Preferred stock, aggregate liquidation value	$ 524	$ 504

Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Shares, Noncurrent

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