Quarterly report pursuant to Section 13 or 15(d)

Supplemental Disclosures - Narrative (Details)

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Supplemental Disclosures - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
Feb. 06, 2020
Dec. 31, 2019
Dec. 31, 2018
Payments for Repurchase of Equity [Abstract]      
Repurchases of common stock   $ 1,898,000 $ 41,330,000
Investments in mutual funds   22,100,000  
Interest paid   200,000 200,000
Income taxes paid   $ 6,300,000 $ 7,100,000
Restricted Stock Units (RSUs)      
Payments for Repurchase of Equity [Abstract]      
Granted (in shares)   287,000  
Vesting period   5 years  
Restricted Stock Units (RSUs) | Member of Board of Directors      
Payments for Repurchase of Equity [Abstract]      
Vesting period   1 year  
Common Stock      
Payments for Repurchase of Equity [Abstract]      
Common shares repurchased (in shares)   26,000 654,000
Stock Repurchase Program, June 2018 | Common Stock      
Payments for Repurchase of Equity [Abstract]      
Stock repurchase programs, authorized amount   $ 200,000,000  
Common shares repurchased (in shares)   26,000 654,000
Repurchases of common stock   $ 1,900,000 $ 41,300,000
Amount remaining available for future stock repurchases   $ 144,100,000  
Subsequent Event | Stock Repurchase Program, June 2018 | Common Stock      
Payments for Repurchase of Equity [Abstract]      
Common shares repurchased (in shares) 30,000    
Repurchases of common stock $ 2,200,000