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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Activity in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     $ 2,215,639 $ 2,178,125
Other comprehensive income before reclassifications     12,576 (2,652)
Reclassification of realized interest on swap agreements     417 2,637
Net current period other comprehensive income $ 3,918 $ 90 12,993 (15)
Ending Balance 2,123,804 2,169,794 2,123,804 2,169,794
AOCI Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     2,614 (798)
Ending Balance $ 13,267 $ (553) 13,267 (553)
AOCI Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Net current period other comprehensive income     $ (2,340) $ 260