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Supplemental disclosures (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 07, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Payments for Repurchase of Equity [Abstract] |  |  |  |
Repurchases of common stock |  | $ 41,330,000 | $ 1,038,000 |
Line of Credit Facility [Abstract] |  |  |  |
Long-term debt |  | 120,321,000 |  | $ 374,000
Loss Contingency, Information about Litigation Matters [Abstract] |  |  |  |
Loss contingency, maximum potential loss |  | 31,000,000 |  |
Line of Credit |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Long-term debt |  | 120,000,000 |  |
Credit Agreement Expiring 2022 |  |  |  |
Debt Instrument, Periodic Payment [Abstract] |  |  |  |
Interest paid |  | 200,000 | $ 100,000 |
Mutual Fund |  |  |  |
Retirement Benefits [Abstract] |  |  |  |
Investments in mutual funds |  | $ 18,000,000 |  |
Restricted Stock Units (RSUs) |  |  |  |
Employee Benefits and Share-based Compensation, Noncash [Abstract] |  |  |  |
Granted (in shares) |  | 330,000 |  |
Vesting period |  | 5 years |  |
Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares purchased |  | 654,000 | 17,000 |
Stock Repurchase Program, June 2018 |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Stock repurchase programs, authorized amount |  | $ 200,000,000 |  |
Stock Repurchase Program, June 2018 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares purchased |  | (650,000) |  |
Repurchases of common stock |  | $ (41,300,000) |  |
Stock Repurchase Program, August 2015 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares purchased |  |  | 17,000 |
Repurchases of common stock |  |  | $ 1,000,000 |
Stock Repurchase Authorized Program, June 2018 |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Amount remaining available for future stock repurchases |  | $ 151,500,000 |  |
Stock Repurchase Authorized Program, June 2018 | Subsequent Event |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Amount remaining available for future stock repurchases | $ 147,400,000 |  |  |
Stock Repurchase Authorized Program, June 2018 | Common Stock | Subsequent Event |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares purchased | (61,900) |  |  |
Repurchases of common stock | $ (4,100,000) |  |  |

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