Series C Cumulative Convertible Redeemable Preferred Stock (Details) $ in Millions	1 Months Ended
	May. 31, 2013 USD ($) shares
Series C Cumulative Convertible Redeemable Preferred Stock.
Preferred stock redeemed (in shares) | shares	4,102,564
Amount paid to redeem Series C preferred stock	$ 101.1
Accrued dividends	1.1
Additional redemption charge	$ 0.1
Preferred stock, Series C Cumulative Convertible Redeemable Preferred Stock, shares outstanding (in shares) | shares	0