Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Change in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 622,442
Net income (loss) for the three months ended March 31, 2019	2,936	$ (4,160)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0	0
Other comprehensive loss - unrealized loss on valuation of swap agreements	(13,306)	5,653
Reclassification of realized interest on swap agreements	(551)	363
Noncontrolling interest contributions	32,191
Noncontrolling interest distributions	(3,237)	(695)
Employee Long-term Incentive Plan Unit Awards	3,454	3,811
Rebalancing adjustment	0	0
Ending Balance	640,421
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	622,442	648,440
Distributions declared of $0.81 and $0.78 per Common OP Unit for nine months ended September 30, 2018 and 2017, respectively	(1,781)	(1,721)
Net income (loss) for the three months ended March 31, 2019	(9,261)	(11,579)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	(2,953)	(642)
Other comprehensive loss - unrealized loss on valuation of swap agreements	(2,299)	1,160
Reclassification of realized interest on swap agreements	(21)	94
Noncontrolling interest contributions	32,191
Noncontrolling interest distributions	(3,237)	(695)
Employee Long-term Incentive Plan Unit Awards	3,360	3,716
Rebalancing adjustment	1,980	1,225
Ending Balance	640,421	639,998
Noncontrolling Interests | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	1,980
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	518,219	545,519
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) for the three months ended March 31, 2019	(10,192)	(12,191)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0	0
Other comprehensive loss - unrealized loss on valuation of swap agreements	(1,605)	886
Reclassification of realized interest on swap agreements	1	84
Noncontrolling interest contributions	32,191
Noncontrolling interest distributions	(3,237)	(695)
Employee Long-term Incentive Plan Unit Awards	0	0
Rebalancing adjustment		0
Ending Balance	535,377	533,603
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	0
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	104,223	102,921
Distributions declared of $0.81 and $0.78 per Common OP Unit for nine months ended September 30, 2018 and 2017, respectively	(1,781)	(1,721)
Net income (loss) for the three months ended March 31, 2019	931	612
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	(2,953)	(642)
Other comprehensive loss - unrealized loss on valuation of swap agreements	(694)	274
Reclassification of realized interest on swap agreements	(22)	10
Noncontrolling interest contributions	0
Noncontrolling interest distributions	0	0
Employee Long-term Incentive Plan Unit Awards	3,360	3,716
Rebalancing adjustment	1,980	1,225
Ending Balance	105,044	$ 106,395
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	$ 1,980