Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Receivables, net of allowance for doubtful accounts (in dollars)	$ 2,071	$ 2,004
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	82,282,931	81,329,210
Common stock, shares outstanding	80,115,538	79,161,817
Treasury stock, shares issued	2,167,393	2,167,393
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	8,624	8,624
Preferred stock , shares outstanding	8,624	8,624	8,624