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Quarterly Supplemental Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Supplemental Financial Information [Abstract]
Total income	$ 64,521	$ 62,849	$ 62,152	$ 62,287	$ 59,793	$ 59,832	$ 61,108	$ 61,960	$ 251,809	$ 242,693	$ 257,628
Net income (loss) from continuing operations	8,285	12,243	34,753	2,673	22,904	28,501	50,418	17,376	57,954	119,199	(25,300)
Net income from discontinued operations	(4,474)	9,722	(833)	(576)	3,390	8,819	113,283	8,031	3,839	133,523	28,764
Net income	$ 3,811	$ 21,965	$ 33,920	$ 2,097	$ 26,294	$ 37,320	$ 163,701	$ 25,407	$ 61,793	$ 252,722	$ 3,479
Net income (loss), per common share, basic and diluted	$ 0.00	$ 0.03	$ 0.04	$ 0.00	$ 0.03	$ 0.04	$ 0.19	$ 0.03	$ 0.07	$ 0.29	$ 0.01
Weighted average number of common shares outstanding, basic and diluted	773,562,942	773,517,492	773,381,165	773,316,262	832,094,830	862,212,317	862,205,672	862,205,672

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Quarterly Supplemental Financial Information [Abstract]

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Number of basic and diluted shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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