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Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Millions		6 Months Ended
	Aug. 09, 2019 USD ($) $ / shares shares	Jun. 30, 2019 Segments $ / shares	Dec. 31, 2018 $ / shares
Class of Stock [Line Items]
Preferred stock, par value		$ 0.001	$ 0.001
Number of reportable segments | Segments		1
Subsequent Event | Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock issued (in shares) | shares	10,000
Preferred stock, par value	$ 0.001
Preferred stock issued during the period | $	$ 10.0

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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