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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock Issued
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2017 $ 546.7 $ 3.1 $ 66.3 $ 566.7 $ (89.4)
Beginning Balance (in shares) at Dec. 31, 2017   30,711,299      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 20.5     20.5  
Other comprehensive income, net of tax 10.8       10.8
Dividends declared (13.2)     (13.2)  
Restricted stock issuances, net 0.0        
Restricted stock issuances, net (in shares)   117,828      
Stock-based employee compensation expense 1.4   1.4    
Stock issued to directors as compensation 0.1   0.1    
Stock issued to directors as compensation (in shares)   1,404      
Purchases and retirement of common stock (2.5)     (2.5)  
Purchases and retirement of common stock (in shares)   (62,634)      
Ending Balance at Mar. 31, 2018 562.1 $ 3.1 67.8 569.8 (78.6)
Ending Balance (in shares) at Mar. 31, 2018   30,767,897      
Beginning Balance at Dec. 31, 2018 557.9 $ 3.1 71.1 608.2 (124.5)
Beginning Balance (in shares) at Dec. 31, 2018   30,771,244      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 17.4     17.4  
Other comprehensive income, net of tax 0.7       0.7
Dividends declared (13.6)     (13.6)  
Restricted stock issuances, net 0.0        
Restricted stock issuances, net (in shares)   141,021      
Stock-based employee compensation expense 0.9   0.9    
Stock issued to directors as compensation 0.0   0.0    
Stock issued to directors as compensation (in shares)   1,696      
Purchases and retirement of common stock (0.9)     (0.9)  
Purchases and retirement of common stock (in shares)   (24,372)      
Ending Balance at Mar. 31, 2019 $ 562.1 $ 3.1 $ 72.0 $ 610.8 $ (123.8)
Ending Balance (in shares) at Mar. 31, 2019   30,889,589