Bryanston Settlement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jun. 30, 2013
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest expense	$ 644	$ 2,933	$ 1,323	$ 5,975
Series E Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stock payable	28,359		28,359		$ 29,239
Mandatorily Redeemable Preferred Stock [Member] | Series E Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Share value redeemable upon settlement event	29,900		29,900
Interest expense	$ 310	$ 2,600	$ 620	$ 5,200
Event Occurs after June 30, 2013 and on or Before December 31, 2014 | Mandatorily Redeemable Preferred Stock [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stock payable						$ 28,000
Preferred stock, per share liquidation value (usd per share)						$ 10
Event Occurs After June 30, 2014 and on or Before December 31, 2014 | Mandatorily Redeemable Preferred Stock [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Dividends payable upon settlement event						$ 1,200
Event Does not Occur by June 30, 2015 | Mandatorily Redeemable Preferred Stock [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Number of shares redeemable upon settlement event (shares)	150,000		150,000
Share value redeemable upon settlement event	$ 1,500		$ 1,500
Redeemable period upon settlement event			3 years
Event Does not Occur by June 30, 2015 | Mandatorily Redeemable Preferred Stock Redeemable Over Three Year Period [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Number of shares redeemable upon settlement event (shares)	150,000		150,000
Share value redeemable upon settlement event	$ 1,500		$ 1,500
Minimum | Event Occurs After December 31, 2013 and on or Before December, 31 2014 | Mandatorily Redeemable Preferred Stock [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stock payable						22,800
Maximum | Event Occurs After December 31, 2013 and on or Before December, 31 2014 | Mandatorily Redeemable Preferred Stock [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stock payable						$ 28,000