Stockholders' Equity (Details 3)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share
Common shares outstanding, end of period	37,578,000	37,069,000	37,050,000
Effect of using weighted average common shares outstanding	(333,000)	43,000	339,000
Shares used in computing earnings per share - basic	37,245,000	37,112,000	37,389,000
Effect of shares issuable under stock option plans based on the treasury stock method	183,000	87,000
Effect of contingently issuable restricted shares	108,000	60,000
Shares used in computing earnings per share - diluted	37,536,000	37,259,000	37,389,000
Number of shares of unvested contingently issuable restricted stock outstanding	100,000	200,000	400,000