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Shareholders' Equity and Partners' Capital (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income The following table summarizes the changes in accumulated other comprehensive income:
 
Cash Flow Hedges
 
(in thousands)
Balance at January 1, 2017
$
445

Other comprehensive income before reclassifications
566

Amounts reclassified from accumulated other comprehensive income to interest expense
9,216

Other comprehensive income
9,782

        Less: Other comprehensive (income) attributable to noncontrolling interest
(7,119
)
Balance at December 31, 2017
3,108

Other comprehensive income before reclassifications
5,258

Amounts reclassified from accumulated other comprehensive income to interest expense
(1,130
)
Other comprehensive income
4,128

        Less: Other comprehensive (income) attributable to noncontrolling interest
(3,028
)
Balance at December 31, 2018
$
4,208