Preferred Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Preferred Stock Disclosure [Line Items]
Preferred Stock, Dividend Rate, Percentage		8.875%
Preferred Stock, Percent of Ownership to be Able to Vote		50.00%
Preferred Stock, Prohibited Distributions		$ 15,000
Maximum Preferred Stock Shares Redeemable Within the First Year	50,000	50,000
Preferred Stock, Redemption Amount	$ 250,000	$ 250,000
Preferred Stock, Redemption Premium, Percentage		104.4375%
Preferred Stock, Shares Issued	250,000	250,000		0
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 213,400
Dividends on preferred stock	$ 2,249	$ 2,249	$ 0
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01		$ 0.00
Issuance of warrants to purchase Common Stock	2,750,000
Class of Warrant or Right, Term	10 years
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 16.08	16.08
Cash purchase price per share of Preferred Stock	970.00	$ 970.00
Payment of Commitment Fees for Preferred Stock		$ (5,000)
Sale of preferred stock, net of commitment fees and offerings costs		$ 236,404	$ 0
Temporary Equity, Liquidation Preference Per Share	$ 1,000	$ 1,000
Proceeds from Issuance of Warrants		$ 23,003
On or before the seventh anniversary of the Preferred Stock Issuance Date [Domain]
Preferred Stock Disclosure [Line Items]
Preferred Stock, Dividend Rate, Percentage		12.00%
After August 10, 2024 [Domain]
Preferred Stock Disclosure [Line Items]
Preferred Stock, Dividend Rate, Percentage		12.00%
Libor Rate to Calculate Preferred Stock Dividend Rate		10.00%