Stockholders' Equity - Common and Preferred Stock (Details)					12 Months Ended
	Mar. 02, 2016 USD ($)	Feb. 17, 2016 USD ($) shares	Jan. 04, 2016 USD ($) shares	Feb. 06, 2015 USD ($) shares	Dec. 31, 2015 USD ($) vote_per_stock $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($)	Mar. 07, 2016 USD ($)	Feb. 09, 2015 USD ($) shares	Feb. 19, 2014 USD ($) shares	Jun. 30, 2013 USD ($)	Feb. 16, 2011 shares	Feb. 15, 2011 shares
Class of Stock [Line Items]
Common Stock, Shares Authorized | shares					150,000,000	150,000,000						150,000,000	95,000,000
Proceeds from rights offering, net of expenses					$ 49,528,000	$ 13,180,000	$ 11,178,000
Common stock dividends (in shares) | shares									5,102	6,167
Redemption of preferred stock											$ 1,500,000
Series B
Class of Stock [Line Items]
Voting rights per stock (vote per stock) | vote_per_stock					0.16
Shares convertible for each stock (in shares) | shares					0.054
Preferred stock, per share liquidation value (usd per share) | $ / shares					$ 29	$ 29
Dividends declared per share (usd per share) | $ / shares					$ 2.90
Preferred stock, shares outstanding (in shares) | shares					44,258	44,258
Dividends, Preferred Stock, Cash					$ 167,000
Dividends, Preferred Stock, Multiplier					1.3
Common stock dividends, declared and undeclared									$ 159,000	$ 218,000
Common stock dividends, undeclared						$ 159,000	218,000
Common Stock
Class of Stock [Line Items]
Price per share on issuable shares (usd per share) | $ / shares					$ 3.77
Number of trading dates used to calculated price per share					20 days
Series E
Class of Stock [Line Items]
Voting rights per stock (vote per stock) | vote_per_stock					0.25
Preferred stock, shares outstanding (in shares) | shares					0	27,000
Common stock dividends, undeclared							$ 1,300,000
Preferred stock, per share redemption value (usd per share) | $ / shares					$ 10	$ 10
Preferred stock, dividend rate					8.00%
Cumulative dividends undeclared					$ 524,000
Subsequent Event
Class of Stock [Line Items]
Proceeds from rights offering, net of expenses		$ 285,900,000.0
Subsequent Event | Series B
Class of Stock [Line Items]
Dividends, Preferred Stock, Cash	$ 167,000
Subsequent Event | Series E
Class of Stock [Line Items]
Redemption of preferred stock								$ 1,500,000
Transferable Subscription Rights
Class of Stock [Line Items]
Proceeds from Issuance of Private Placement				$ 50,000,000
Transferable Subscription Rights | Subsequent Event
Class of Stock [Line Items]
Common Stock, Shares Authorized | shares			20,138,888
Proceeds from Issuance of Private Placement		$ 290,000,000
Value of subscription rights to be exercised within 10 days of commencement			$ 30,000,000
Value of subscription rights to be exercised, maximum			290,000,000
Sale of stock, commitment fee			$ 1,450,000
Sale of stock, commitment fee, percent			0.50%
Sale of stock, expenses reimbursed (not exceeding)			$ 50,000
Common Stock | Transferable Subscription Rights | Subsequent Event
Class of Stock [Line Items]
Shares, Issued | shares		20,138,888
Common Stock | Basic Subscription Rights [Member] | Transferable Subscription Rights | Subsequent Event
Class of Stock [Line Items]
Shares, Issued | shares		176,086
Common Stock | Over Subscription Rights [Member] | Transferable Subscription Rights | Subsequent Event
Class of Stock [Line Items]
Shares, Issued | shares		13,136,817
Kien Huat Realty Limited [Member] | Common Stock | Standby Purchase Agreement [Member]
Class of Stock [Line Items]
Shares, Issued | shares				533,433
Kien Huat Realty Limited [Member] | Common Stock | Standby Purchase Agreement [Member] | Subsequent Event
Class of Stock [Line Items]
Shares, Issued | shares		6,825,985
Kien Huat Realty Limited [Member]
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent					88.70%
Kien Huat Realty Limited [Member] | Subsequent Event
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent			88.70%