Warrants and Restricted Stock Units (May Investors) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jan. 30, 2009
Class of Warrant or Right [Line Items]
Preferred Stock, Shares Sold (in shares)	0	0
Series C Preferred Stock
Class of Warrant or Right [Line Items]
Preferred Stock, Shares Sold (in shares)			266,657
Preferred stock, total exercise price of warrant			$ 267,000,000
May Investors
Class of Warrant or Right [Line Items]
Warrants exercised (in shares)	237,627
Warrants outstanding (in shares)	0
Liability from warrants	$ 0	$ 4,000,000
May Investors | Common Stock
Class of Warrant or Right [Line Items]
Shares issued (shares)	154,313
Troubled Asset Relief Program
Class of Warrant or Right [Line Items]
Number of shares auctioned by warrants			645,138
Warrants exercised (used per share)			$ 62.00