Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2014
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Oct. 31, 2018
Class of Stock [Line Items]            
Authorized amount of common stock repurchase $ 50,000,000.0         $ 100,000,000.0
Number of shares repurchased (in shares)   0 0 0 0  
Common Stock            
Class of Stock [Line Items]            
Repurchase period (in years) 1 year