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Shareholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) $ / shares shares | Feb. 28, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | May 31, 2017 $ / shares shares | Dec. 31, 2018 vote $ / shares
Class of Stock [Line Items] |  |  |  |  |
Proceeds from follow-on public offering, net of issuance costs | $ 394,704 | $ 646,984 | $ 560,057 |  |
Public offering price per share (in dollars per share) | $ / shares | $ 154.00 | $ 137.00 |  | $ 91.00 | $ 154.00
Stock issuance costs | $ 5,696 | $ 10,616 |  |  |
Underwriting discounts and commissions |  |  | 14,390 |  |
Other offering expenses |  |  | $ 1,128 |  |
Class A Subordinate Voting |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Voting rights (in votes per share) | vote |  |  |  |  | 1
Class B Multiple Voting |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Voting rights (in votes per share) | vote |  |  |  |  | 10
Voting shares convertible (per share) |  |  |  |  | 1
IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of stock (in shares) | shares |  |  |  | 5,500,000 |
IPO | Class A Subordinate Voting |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of stock (in shares) | shares | 2,600,000 | 4,800,000 |  |  |
Over-Allotment Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of stock (in shares) | shares |  |  | 825,000 |  |

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