The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of general partner units outstanding.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The number of limited partner units outstanding.

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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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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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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Unit conversion factor for common stock assigned at the time of the merger.

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ACCOUNTING POLICIES - Redeemable OP Unitholder and Noncontrolling Interest (Details) $ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2017 USD ($) shares	Jan. 31, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Redeemable Noncontrolling Interest [Line Items]
Conversion of stock, value redeemed \| $		$ 20.9
Fair value of operating partnership units exceeding cost \| $	$ 160.5		$ 160.5	$ 177.2
Partner redemptions \| $	$ 15.8
Common Stock
Redeemable Noncontrolling Interest [Line Items]
Conversion of stock, shares Issued (in shares)		341,776
Class C Units
Redeemable Noncontrolling Interest [Line Items]
Partners' capital account, units, redeemed (in shares)		341,776
NHP/PMB L.P.
Redeemable Noncontrolling Interest [Line Items]
Unit conversion factor for common stock	0.9051		0.9051
NHP/PMB L.P. \| Limited Partner
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units, outstanding (in shares)	2,726,442		2,726,442
Percentage of ownership interest on total units outstanding			27.50%
NHP/PMB L.P. \| General Partner
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest on total units outstanding			72.50%
Limited partnership units outstanding (in shares)	7,176,441		7,176,441