Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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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
-Paragraph 15
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Related Party Transactions (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	9 Months Ended
	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Payment of dividends on Series A Preferred Stock		$ 11,103	$ 5,252
Series A Preferred Stock
Related Party Transaction [Line Items]
Payment of dividends on Series A Preferred Stock		11,103	$ 5,175
Affiliated Entity \| Series A Preferred Stock \| KKR
Related Party Transaction [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	60
Affiliated Entity \| Series A Preferred Stock \| Snow Phipps
Related Party Transaction [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	15
Affiliated Entity \| Series A Preferred Stock \| KKR And Snow Phipps
Related Party Transaction [Line Items]
Preferred stock dividends declared and paid		$ 1,822