Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash dividends declared per share	$ 2.46	$ 2.30	$ 2.15
Tax effect on share-based awards exercised	$ 7,024	$ 17,766	$ 12,905
Common Stock [Member]
Tax effect on share-based awards exercised	7,024	17,766	12,905
Additional Paid-In Capital [Member]
Tax effect on share-based awards exercised	$ 7,024	$ 17,766	$ 12,905
Retained Earnings [Member]
Cash dividends declared per share	$ 2.46	$ 2.30	$ 2.15
Total Parent Equity [Member]
Cash dividends declared per share	$ 2.46	$ 2.30	$ 2.15
Tax effect on share-based awards exercised	$ 7,024	$ 17,766	$ 12,905