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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Change in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 648,440
Net income (loss)	$ (2,597)	$ 13,285	(9,027)	$ 39,364
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership			0	0
Other comprehensive income - unrealized gain on valuation of swap agreements	3,973	(644)	12,576	(2,652)
Reclassification of realized interest on swap agreements	(55)	734	417	2,637
Noncontrolling interest contributions			46,990	20,522
Noncontrolling interest distributions			(24,654)	(7,278)
Employee Long-term Incentive Plan Unit Awards			8,332	9,129
Rebalancing adjustment			0	0
Ending Balance	638,040		638,040
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			648,440	589,548
Distributions declared of $0.81 and $0.78 per Common OP Unit for nine months ended September 30, 2018 and 2017, respectively			(5,126)	(4,805)
Net income (loss)			(33,336)	(1,194)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership			(1,957)	(1,086)
Other comprehensive income - unrealized gain on valuation of swap agreements			2,060	(794)
Reclassification of realized interest on swap agreements			280	534
Noncontrolling interest contributions			46,990	20,522
Noncontrolling interest distributions			(24,654)	(7,278)
Employee Long-term Incentive Plan Unit Awards			7,924	8,704
Rebalancing adjustment			(2,581)	2,105
Ending Balance	638,040	606,256	638,040	606,256
Noncontrolling Interests | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	(2,581)		(2,581)
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			545,519	494,126
Distributions declared of $0.81 and $0.78 per Common OP Unit for nine months ended September 30, 2018 and 2017, respectively			0	0
Net income (loss)			(35,313)	(4,010)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership			0	0
Other comprehensive income - unrealized gain on valuation of swap agreements			1,435	(726)
Reclassification of realized interest on swap agreements			270	418
Noncontrolling interest contributions			46,990	20,522
Noncontrolling interest distributions			(24,654)	(7,278)
Employee Long-term Incentive Plan Unit Awards			0	0
Rebalancing adjustment				0
Ending Balance	534,247	503,052	534,247	503,052
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	0		0
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			102,921	95,422
Distributions declared of $0.81 and $0.78 per Common OP Unit for nine months ended September 30, 2018 and 2017, respectively			(5,126)	(4,805)
Net income (loss)			1,977	2,816
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership			(1,957)	(1,086)
Other comprehensive income - unrealized gain on valuation of swap agreements			625	(68)
Reclassification of realized interest on swap agreements			10	116
Noncontrolling interest contributions			0	0
Noncontrolling interest distributions			0	0
Employee Long-term Incentive Plan Unit Awards			7,924	8,704
Rebalancing adjustment			(2,581)	2,105
Ending Balance	103,793	$ 103,204	103,793	$ 103,204
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	$ (2,581)		$ (2,581)

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