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v3.20.1

Equity - Activity for Class B Common Stock and Treasury Stock (Details) - shares | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | 8,375,077 | 8,702,074
Stock Award Activity | (649,581) | (498,324)
Purchase of Treasury Stock | 714,251 | 60,833
Ending Balance | 8,439,747 | 8,264,583
Class B Shares |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | 101,130,379 | 100,803,382
Stock Award Activity | 649,581 | 498,324
Purchase of Treasury Stock | (714,251) | (60,833)
Ending Balance | 101,065,709 | 101,240,873
Purchase of Treasury Stock | 714,000 |

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- Definition The increase (decrease) during the period in the number of shares issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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