Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts and rents receivable (net of allowance of $1,032 and $2,187)	$ 1,032	$ 2,187
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, number of shares authorized	40,000,000	40,000,000
Preferred stock, number of shares outstanding	0	0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, Shares authorized	1,460,000,000	1,460,000,000
Common stock, number of shares issued	773,304,997	862,205,672
Common stock, number of shares outstanding	773,304,997	862,205,672