XML 42 R93.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Capital Stock (Share Repurchase Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]                      
Number of Shares (in shares) 133,379 1,169,597 697,255 872,317 1,000,881 870,538 960,105 407,091 2,872,548 3,238,615  
Average Repurchase Price per Share (in dollars per share) $ 78.72 $ 78.11 $ 90.92 $ 89.70 $ 88.57 $ 87.59 $ 81.54 $ 94.79 $ 84.77 $ 87.00  
Amount (in thousands) $ 10,499 $ 91,357 $ 63,393 $ 78,249 $ 88,651 $ 76,248 $ 78,287 $ 38,588 $ 243,498 $ 281,774 $ 302,109