Bryanston Settlement (Details) - USD ($) $ in Thousands			12 Months Ended
	Mar. 07, 2016	Jun. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Redemption of preferred stock		$ 1,500
Shares redeemed			$ 534		$ 25,619
Series E payable					1,300
Interest expense			2,616	$ 9,128	1,331
Series E
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Series E payable			1,500	1,241
Mandatorily Redeemable Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Dividends payable upon settlement event		1,200
Mandatorily Redeemable Preferred Stock | Series E
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest expense			1,200	$ 7,700	0
Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Shares redeemed		$ 1,500
Preferred Stock | Series E
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Shares redeemed			$ 1		$ 6,854
Subsequent Event | Series E
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Payments for Repurchase of Private Placement	$ 30,700
Redemption of preferred stock	$ 1,500