Capital Stock Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Capital Stock Transactions [Abstract]

Schedule Of Capital Stock Repurchases

		For the Years Ended December 31,
		2017		2016		2015
Total cost of repurchased shares (in thousands):	$	94,640	$	102,313	$	59,323
Shares repurchased		500,000		780,134		460,765
Weighted average price per share	$	189.28	$	131.15	$	128.75