Income (Loss) Per Share (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted Average Shares Outstanding Details [Table]
Number of weighted average common shares outstanding	77,954,000	77,293,000	76,616,000
Assumed exercise of stock options	886,000	670,000	1,375,000
Average diluted shares outstanding	78,840,000	77,963,000	77,991,000
Antidilutive stock options excluded from average diluted shares outstanding	2,061,534	2,832,192	2,831,118