Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 31, 2015 shares	Mar. 31, 2016 USD ($) director $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Jul. 30, 2015 shares	Jul. 28, 2015 shares	Mar. 05, 2014 shares
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Preferred stock, undesignated shares authorized		34,180,000
Common stock, shares outstanding (in shares)	43,750,000	36,692,000	36,682,000	350,000,000
Common stock, shares authorized (in shares)	125,000,000	125,000,000	125,000,000	1,000,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Common stock, shares issued (in shares)		36,692,000	36,682,000
Remaining shares authorized to be repurchased (in shares)		1,874,366
Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, shares authorized (in shares)					9,000,000	50,000,000
Common Stock
Class of Stock [Line Items]
Reverse stock split, conversion ratio, authorized	0.125
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		9,610,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Preferred stock, dividend rate		8.25%	8.25%
Preferred stock, shares issued (in shares)		2,181,000	2,181,000
Preferred stock, shares outstanding (in shares)		2,181,000	2,181,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares		$ 25.00	$ 25.00
Preferred stock, aggregate liquidation preference | $		$ 54,514	$ 54,514
Preferred stock, designated but unissued shares authorized		7,429,000
Preferred stock, period stock receives voting rights if dividends are not paid (in months)		18 months
Number of additional directors elected | director		2
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		6,210,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Preferred stock, dividend rate		7.875%	7.875%
Preferred stock, shares issued (in shares)		5,650,000	5,650,000
Preferred stock, shares outstanding (in shares)		5,650,000	5,650,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares		$ 25.00	$ 25.00
Preferred stock, aggregate liquidation preference | $		$ 141,250	$ 141,250
Preferred stock, designated but unissued shares authorized		560,000
Preferred stock, period stock receives voting rights if dividends are not paid (in months)		18 months
Number of additional directors elected | director		2