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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,156	$ 2,407	$ 24,922	$ 33,151
Other comprehensive income (loss):
Change in fair value of interest rate hedges	(14)	217	(424)	(990)
Realized (gains) losses on interest rate hedges reclassified to earnings	(14)	251	177	271
Total other comprehensive income	(28)	468	(247)	(719)
Comprehensive income (loss) before allocation to noncontrolling interests	1,128	2,875	24,675	32,432
Allocation to noncontrolling interests	(33)	(140)	(979)	(1,972)
Comprehensive income (loss)	$ 1,095	$ 2,735	$ 23,696	$ 30,460

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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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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. 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 and reclassification adjustments of other comprehensive income (loss).

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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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