Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_PreferredStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

REDEEMABLE PREFERRED STOCK - Aggregate Dividends Accumulated (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Dividends Accumulated		$ 3,152		$ 0	$ 6,304	$ 0
Series L Preferred Stock
Class of Stock [Line Items]
Number of shares (in shares)	8,080,740	8,080,740	8,080,740		8,080,740
Dividends Accumulated	$ 1,436	$ 3,152	$ 3,152