Consolidated Statements of Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax benefit of Stock compensation plans	$ 1,268	$ 494	$ 2,469
Cash dividends per share	$ 0.42	$ 0.42	$ 0.42
Capital In Excess of Par Value [Member]
Tax benefit of Stock compensation plans	1,268	494	2,469
Retained Earnings [Member]
Tax benefit of Stock compensation plans	1,268	494	2,469
Cash dividends per share	$ 0.42	$ 0.42	$ 0.42
Common Shares in Treasury [Member]
Tax benefit of Stock compensation plans	1,268	494	2,469
Total Parent Stockholders' Equity [Member]
Tax benefit of Stock compensation plans	$ 1,268	$ 494	$ 2,469
Cash dividends per share	$ 0.42	$ 0.42	$ 0.42