Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) - USD ($)
3 Months Ended 25 Months Ended
Dec. 12, 2017
Mar. 31, 2018
Mar. 31, 2018
Feb. 24, 2016
Class of Stock [Line Items]        
Authorized repurchase of common stock, amount       $ 50,000,000
Treasury Stock        
Class of Stock [Line Items]        
Number of shares repurchased (in shares)   0 1,675,000  
Repurchase of shares $ 50,000,000 $ 0