Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Preferred Stock, Par or Stated Value Per Share (usd per share)		$ 0.01
Preferred Stock, Shares Authorized	10,000,000	9,945,539
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share (usd per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	87,499,669	85,529,386
Common Stock, Shares, Outstanding	87,499,669	85,529,386
6.75% Series C Cumulative Redeemable Perpetual Preferred Stock
Preferred Stock, Par or Stated Value Per Share (usd per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	0	54,461
Preferred Stock, Shares Issued	0	54,458
Preferred Stock, Shares Outstanding	0	54,458