Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Activity in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 2,106,352	$ 2,164,667	$ 2,081,947	$ 2,215,639
Other comprehensive loss before reclassifications	(22,652)	2,950	(35,958)	8,603
Reclassification of realized interest on swap agreements	(535)	109	(1,086)	472
Net current period other comprehensive Income (loss)	(23,187)	3,059	(37,044)	9,075
Ending Balance	2,100,106	2,112,549	2,100,106	2,112,549
AOCI Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net current period other comprehensive Income (loss)	4,638	(297)	6,958	(1,551)
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(11,021)	7,376	516	2,614
Ending Balance	$ (29,570)	$ 10,138	$ (29,570)	$ 10,138

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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