Shareholders' Equity and Stock Options (Details 2) (USD $)				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 $6.91-$13.83 [Member]	Dec. 31, 2013 $16.81-$18.20 [Member]	Dec. 31, 2013 $20.23-$30.24 [Member]	Dec. 31, 2013 $ 6.91-$30.24 [Member]
Summary of options outstanding segregated by ranges of exercise prices
Total Outstanding Options, Options	956,814	1,882,939	2,600,583	178,858	527,437	250,519	956,814
Total Outstanding Options, Weighted Average Option Price per Share		$ 14.73		$ 13.58	$ 17.17	$ 20.95	$ 17.49
Total Outstanding Options, Weighted Average Remaining Term				3 years 1 month 6 days	4 years 7 months 6 days	6 years 1 month 6 days	4 years 8 months 12 days
Vested and Exercisable Options	314,445	1,161,703		119,543	187,955	6,947	314,445
Vested and Exercisable Options, Weighted Average Option Price per Share		$ 14.28	$ 15.57	$ 13.45	$ 17.10	$ 20.24	$ 15.78
Vested and Exercisable Options, Weighted Average Remaining Term				3 years 1 month 6 days	4 years 2 months 12 days	3 months 18 days	3 years 8 months 12 days