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Stockholders' Equity and Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The following table summarizes the significant components of Accumulated other comprehensive loss:
Years Ended December 31,
202020192018
Foreign Currency Translation Adjustments
Balance at beginning of period$(2,278)$(2,250)$(1,606)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of tax and impact of adoption of accounting standards(a)(b)(480)(56)(664)
Reclassification adjustment, net of tax(a)23 28 20 
Other comprehensive loss, net of tax(a)(457)(28)(644)
Balance at end of period$(2,735)$(2,278)$(2,250)
Defined Benefit Plans
Balance at beginning of period$(8,859)$(6,737)$(6,398)
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of impact of adoption of accounting standards(b)(2,661)(2,769)(580)
Tax benefit444 463 100 
Other comprehensive loss and noncontrolling interests before reclassification adjustment, net of tax and impact of adoption of accounting standards(b)(2,217)(2,306)(480)
Reclassification adjustment, net of tax(a)422 184 141 
Other comprehensive loss, net of tax(1,795)(2,122)(339)
Balance at end of period(c)$(10,654)$(8,859)$(6,737)
__________
(a)    The income tax effect was insignificant in the years ended December 31, 2020, 2019 and 2018.
(b)    The noncontrolling interests are insignificant in the years ended December 31, 2020, 2019 and 2018.
(c)    Primarily consists of unamortized actuarial loss on our defined benefit plans.