CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Interest rate swaps, tax benefit	$ 5,260	$ 6,161	$ 342
Pension adjustment, tax expense	(87)	$ 41	$ 467
Deconsolidation of 110 North Wacker, tax expense	951
Share of investee's other comprehensive income, tax expense	$ 285

Other Comprehensive Income (Loss), Deconsolidation Of Previously Consolidated Variable Interest Entity, Tax

No definition available.

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- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss) (OCI) for proportionate share of equity method investee's OCI.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32472-111569

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- Definition

Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580

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- Definition

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

+ References

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-Publisher FASB
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-SubTopic 10
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-Topic 810
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-Section 45
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- References

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