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Subsequent Events - Additional Information (Narrative) (Details) - Subsequent Event [Member] - $ / shares | Feb. 26, 2018 | Feb. 12, 2018 | Feb. 01, 2018
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Subsequent Events [Line Items] |  |  |
Date of announcement of dividend |  |  | Feb. 01, 2018
Date of payment of dividend | Feb. 26, 2018 |  |
Date of record of dividend |  | Feb. 12, 2018 |
Common Class A [Member] |  |  |
Subsequent Events [Line Items] |  |  |
Quarterly dividend payable amount per share |  |  | $ 0.11
Class B Stock |  |  |
Subsequent Events [Line Items] |  |  |
Quarterly dividend payable amount per share |  |  | $ 0.11

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- Definition Subsequent events. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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