Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Receivables, allowance for doubtful accounts (in dollars)	$ 3,097	$ 2,983
Loans to the JIVDC, allowance for loan losses	$ 64,052	$ 64,052
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	93,822,683	93,392,635
Common stock, shares outstanding	91,655,290	91,225,242
Treasury stock, shares held	2,167,393	2,167,393
Series B Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series C Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	18,500	18,500
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0