Consolidated Statement of Shareholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax on pension liability	$ (448)	$ 605	$ 80
Dividends declared per share (in dollars per share)	$ 0.52	$ 0.36	$ 0.32
Accumulative Other Comprehensive Income (Loss) [Member]
Tax on pension liability	$ (448)	$ 605	$ 80
Retained Income (Deficit) [Member]
Dividends declared per share (in dollars per share)	$ 0.52	$ 0.36	$ 0.32