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Noncontrolling Interests - Schedule of Noncontrolling Interests Activity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Dec. 31, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Issuance of limited partnership units	$ 25,000	$ 0
Distributions of units to noncontrolling interest	269
Distributions to noncontrolling interests	(4,903)	(4,585)	$ (1,089)	$ (1,077)
Allocated distributions to noncontrolling interests subject to redemption	(11)	(13)	(4)	(3)
Net income	16,088	6,530	7,711	6,553
Other comprehensive income (loss)	(12,803)	(8,137)	749	3,466
Non- controlling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		232,203		31,105	$ 232,203	$ 31,105
Issuance of limited partnership units	25,000				30,039	205,000
Distributions of units to noncontrolling interest	269				269	0
Distributions to noncontrolling interests	(4,903)	(4,585)	(1,089)	(1,077)	(9,488)	(4,368)
Allocated distributions to noncontrolling interests subject to redemption	(11)	(13)	(4)	(3)	(24)	(13)
Net income	1,880	1,197	280	234	3,077	789
Other comprehensive income (loss)	(1,489)	$ (1,408)	$ 27	$ 122	(2,897)	(310)
Ending balance	$ 253,179				$ 253,179	$ 232,203

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Decrease in noncontrolling interest balance from payment of dividends or other distributions to holders of noncontrolling interest with redemption rights that are not controlled by the company.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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