Preferred Stock (Details Textual) - USD ($)	Oct. 31, 2018	Aug. 29, 2018	May 25, 2018	Jan. 19, 2018	Sep. 30, 2018	Dec. 31, 2017
Preferred Stock, Shares Issued				350,000	350,000	0
Preferred Stock, Par or Stated Value Per Share				$ 0.01	$ 0.01	$ 0
Convertible Preferred Stock, Shares Issued upon Conversion				10,606,061	10,940,681
Common Stock, Par or Stated Value Per Share					$ 0.01	$ 0.01
Preferred Stock, Dividend Rate, Percentage				7.00%
Preferred stock per share annualized dividend				$ 70.00
Preferred Stock, Redemption Price Per Share				33.00
Minimum required closing share price for the Company to cause conversion				$ 47.85
Preferred Stock, Minimum Conversion Amount				$ 50,000,000
Minimum cash consideration in change of control to require conversion				90.00%
Minimum affirmative vote of preferred stockholders required to undertake certain transactions				66.66%
Option change in control redemption premium, less than 90% cash transaction				101.00%
Maximum parity stock issuable, amount				$ 250,000,000
Maximum aggregate value of outstanding preferred stock to issue parity stock				$ 100,000,000
Preferred stock ownership required for preemptive rights				75.00%
Preferred stock ownership required to have board observer				50.00%
Minimum ownership required to maintain registration rights				5.00%
Dividends, Preferred Stock, Paid-in-kind		$ 6,200,000	$ 4,800,000
Subsequent Event [Member]
Dividends, Preferred Stock, Paid-in-kind	$ 6,300,000
Cumulative Preferred Stock [Member]
Shares Issued, Price Per Share				$ 1,000
Stock Issued During Period, Value, New Issues				$ 350,000,000
Payments of Stock Issuance Costs				$ 7,700,000
On or prior to the first anniversary of the Issue Date [Domain]
Cash Change of Control Conversion Premium				130.00%
On or prior to the second anniversary of the Issue Date [Domain]
Cash Change of Control Conversion Premium				120.00%
On or prior to the third anniversary of the Issue Date [Domain]
Cash Change of Control Conversion Premium				105.00%
After the third anniversary of the Issue Date [Domain]
Cash Change of Control Conversion Premium				101.00%