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v3.19.1

Capital Stock (Details) - shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common Stock, Shares, Outstanding | 38,461,948 |  | 38,169,575
Stock repurchased and retired (in shares) | 0 | 0 |
Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common Stock, Shares, Outstanding | 22,374,171 |  | 22,453,672

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