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Equity and Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Equity and Accumulated Other Comprehensive Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation, Beginning balance | $ (92,401) |  |  | $ (88,795) | $ (106,770) |  |  | $ (91,472) | $ (88,795) |  | $ (91,472) |  |  |
Foreign currency translation, Other comprehensive income (loss) before reclassifications | (7,100) |  |  |  | 5,975 |  |  |  | (10,706) |  | (9,323) |  |  |
Foreign currency translation, Net other comprehensive income (loss), net of tax | (7,100) |  |  |  | 5,975 |  |  |  | (10,706) |  | (9,323) |  |  |
Foreign currency translation, Ending balance | (99,501) |  | $ (92,401) |  | (100,795) |  | $ (106,770) |  | (99,501) |  | (100,795) |  |  |
Unrealized gain (loss) on on derivatives, Beginning balance | (583) |  |  | (840) | (2,445) |  |  | 0 | (840) |  | 0 |  |  |
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications | (141) |  |  |  | 505 |  |  |  | 100 |  | (2,905) |  |  |
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss | 8 |  |  |  | 517 |  |  |  | 24 |  | 1,482 |  |  |
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax | (133) | [1] | 386 | $ (129) | 1,022 | [1] | 1,210 | $ (3,655) | 124 | [1] | (1,423) | [1] |  |
Unrealized gain (loss) on on derivatives, Ending balance | (716) |  | (583) |  | (1,423) |  | (2,445) |  | (716) |  | (1,423) |  |  |
Total, Other comprehensive income (loss) before reclassifications | (7,241) |  |  |  | 6,480 |  |  |  | (10,606) |  | (12,228) |  |  |
Total, Amounts reclassified from accumulated other comprehensive loss | 8 |  |  |  | 517 |  |  |  | 24 |  | 1,482 |  |  |
Total, Net other comprehensive income (loss), net of tax | (7,233) |  |  |  | 6,997 |  |  |  | (10,582) |  | (10,746) |  |  |
Accumulated other comprehensive income (loss), net of tax, total | $ (100,217) |  | $ (92,984) |  | $ (102,218) |  | $ (109,215) |  | $ (100,217) |  | $ (102,218) |  | $ (89,635) | $ (91,472)
[1] | Net of tax expense of $120 for the three and nine months ended September 30, 2021.

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=116690757&loc=SL116692626-108610 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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