Consolidated and Combined Statements of Equity - USD ($) shares in Thousands, $ in Thousands		Total		Common Shares	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Former Parent Equity		Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2014		$ 1,988,915						$ 1,988,347		$ 568
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		49,628						49,628
Deferred compensation shares and options, net		4,506						4,506
Contributions from former parent, net		16,442						16,495		(53)
Issuance of common shares in connection with the Combination	[1]	0
Other comprehensive income		0
Balance at end of period at Dec. 31, 2015		2,059,491						2,058,976		515
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		61,974						61,974
Deferred compensation shares and options, net		4,502						4,502
Distributions to former parent, net		(3,983)						(3,763)		(220)
Issuance of common shares in connection with the Combination	[1]	0
Other comprehensive income		0
Balance at end of period at Dec. 31, 2016		2,121,984						2,121,689		295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common shareholders		(71,756)				$ (42,729)		(29,024)	[2]	(3)
Net income (loss)		(79,084)
Deferred compensation shares and options, net		1,526						1,526
Contributions from former parent, net		333,020						333,020
Issuance of common limited partnership units at the Separation		(96,632)						(96,632)
Issuance of common shares at the Separation (in shares)				94,736
Issuance of common shares at the Separation		0		$ 947	$ 2,329,632			(2,330,579)
Issuance of common shares in connection with the Combination (in shares)				23,219
Issuance of common shares in connection with the Combination		864,918	[1]	$ 233	864,685
Noncontrolling interests acquired in connection with the Combination		3,586								3,586
Dividends declared on common shares ($0.45 per common share)		(53,080)				(53,080)
Distributions to noncontrolling interests		(171)								(171)
Contributions from noncontrolling interests		499								499
Redeemable noncontrolling interest redemption value adjustment and other comprehensive income allocation		(130,917)			(130,692)		$ (225)
Other comprehensive income		$ 1,837					1,837
Balance at end of period (in shares) at Dec. 31, 2017		117,955		117,955
Balance at end of period at Dec. 31, 2017		$ 2,974,814		$ 1,180	$ 3,063,625	$ (95,809)	$ 1,612	$ 0		$ 4,206

[1] See Note 3 for information regarding assets, liabilities and noncontrolling interests acquired in the Formation Transaction.

[2] Net loss incurred from January 1, 2017 through July 17, 2017 is attributable to our former parent as it was the sole shareholder through July 17, 2017. See Note 1 for additional information.