Consolidated Statements of Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Treasury Shares
Purchase of treasury shares	0	0	128
Additional Paid-in Capital
Income tax on stock option exercise and other shares issued to employees and directors	$ 1,243	$ 710	$ 1,197
Stock option exercises and other shares issued to employees and directors, shares	224	215	225
Retained Earnings
Dividends declared, per common share	$ 0.43	$ 0.4	$ 0.3206666667