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Capital Stock (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) director common_share shares | Sep. 30, 2018 USD ($) director common_share $ / shares | Sep. 30, 2017 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |
Classes of common shares | common_share |  | 2 | 2 |
Accelerated share repurchase program, agreement to repurchase | $ 25,000,000 |  |  |
Accelerated share repurchases, payment |  | $ 25,000,000 | $ 25,000,000 |
Stock Repurchased and Retired During Period, Shares | shares |  | 1,300,000.0 |  |
Accelerated Share Repurchase Program, Amount Of Shares Repurchased, Percent |  | 80.00% |  |
Stock repurchased during period, value |  |  | $ 30,270,000 | $ 11,705,000
Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Minimum number of directors up for election to entitle shareholders to vote | director |  | 0.3333 | 0.3333 |
Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Minimum number of directors up for election to entitle shareholders to vote | director |  | 3 | 3 |
Common stock, Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount | $ 100,000,000 |  |  |
Stock repurchased during period, value |  |  | $ 5,300,000 | $ 11,700,000
Stock repurchase program, remaining authorized amount |  | $ 52,300,000 | $ 52,300,000 |
Common stock, Class A | Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchased during period (in dollars per share) | $ / shares |  |  | $ 13.29 | $ 16.82
Common stock, Class A | Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchased during period (in dollars per share) | $ / shares |  |  | $ 16.86 | $ 23.01

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- Definition The amount needed to adjust previously recorded stockholders' equity balances to the actual aggregate amounts paid, whether in cash or other consideration, to acquire all of the shares purchased under an Accelerated Share Repurchase arrangement. + References No definition available. + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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