Earnings Per Share(Schedule of Weighted Average Number of Shares for calculating diluted earnings per share) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted average common shares outstanding	30,850	30,703	30,680
Diluted	30,999	30,991	31,166
Stock Options [Member]
Common and potential common shares		61	257
Unvested Restricted Stock Units [Member]
Common and potential common shares	149	226	226
Unvested Restricted Stock [Member]
Common and potential common shares		1	3