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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 31,441	$ (9,555)	$ 30,156
Other comprehensive income (loss):
Change in fair value of interest rate hedges	845	3,354	(8)
Realized (gains) losses on interest rate hedges reclassified to earnings	107	492
Total other comprehensive income	952	3,846	(8)
Comprehensive income (loss) before allocation to noncontrolling interests	32,393	(5,709)	30,148
Allocation to noncontrolling interests	(1,244)	(401)	(1,914)
Comprehensive income (loss) allocable to common shares	$ 31,149	$ (6,110)	$ 28,234

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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