CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Allowance for doubtful accounts	$ 6,481,000	$ 2,974,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	60,390,149	60,233,561
Common stock, shares outstanding	60,390,149	60,233,561
Series B Preferred Stock [Member]
Preferred Stock, par value	$ 0.001	$ 0.001
Preferred Stock, liquidation preference per share	$ 0.001	$ 0.001
Preferred Stock, shares authorized	40,000,000	40,000,000
Preferred Stock, shares issued	25,042,130	25,044,939
Preferred Stock, shares outstanding	25,042,130	25,044,939
Series J Preferred Stock [Member]
Preferred Stock, par value	$ 0	$ 0
Preferred Stock, liquidation preference	$ 192,500,000	$ 192,500,000
Preferred Stock, shares authorized	7,700,000	7,700,000
Preferred Stock, shares issued	7,700,000	7,700,000
Preferred Stock, shares outstanding	7,700,000	7,700,000
Series K Preferred Stock [Member]
Preferred Stock, par value	$ 0	$ 0
Preferred Stock, liquidation preference	$ 170,000,000	$ 170,000,000
Preferred Stock, shares authorized	6,800,000	6,800,000
Preferred Stock, shares issued	6,800,000	6,800,000
Preferred Stock, shares outstanding	6,800,000	6,800,000