XML 66 R50.htm IDEA: XBRL DOCUMENT v3.8.0.1
Capital Stock Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2017
May 31, 2017
Jan. 31, 2015
Equity, Class of Treasury Stock [Line Items]                
Common stock, issued 49,276,000   49,276,000 49,276,000        
Payments of Dividends     $ 36,836 $ 19,808 $ 0      
2015 Share Repurchase Program                
Equity, Class of Treasury Stock [Line Items]                
Number of shares authorized to be repurchased               2,000,000
Stock repurchased during period (shares)   228,000            
Stock repurchased during period (amount)   $ 10,000            
Stock Repurchase program, Average Cost Per Share   $ 43.94            
2017 Share Repurchase Program [Member]                
Equity, Class of Treasury Stock [Line Items]                
Number of shares authorized to be repurchased           100,000,000 100,000,000  
Stock repurchased during period (shares) 239,000   1,388,000          
Stock repurchased during period (amount)     $ 83,000          
Stock Repurchase program, Average Cost Per Share     $ 59.80          
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 17,000   $ 17,000