Stock Plans and Management Compensation (Details 2) shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Range 01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 3.37
Exercise price range, upper range limit (in dollars per share)	$ 5.99
Number of outstanding options (in shares) | shares	274
Outstanding options, weighted average exercise price (in dollars per share)	$ 5.21
Number of options exercisable (in shares) | shares	274
Outstanding options, weighted average remaining years of contractual life (in years)	3 years 2 months 12 days
Exercisable options, weighted average remaining years of contractual life (in years)	3 years 2 months 12 days
Exercisable options, weighted average exercise price (in dollars per share)	$ 5.21
Range 02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	6.00
Exercise price range, upper range limit (in dollars per share)	$ 19.90
Number of outstanding options (in shares) | shares	1,093
Outstanding options, weighted average exercise price (in dollars per share)	$ 12.20
Number of options exercisable (in shares) | shares	1,093
Outstanding options, weighted average remaining years of contractual life (in years)	3 years 10 months 24 days
Exercisable options, weighted average remaining years of contractual life (in years)	3 years 10 months 24 days
Exercisable options, weighted average exercise price (in dollars per share)	$ 12.20
Range 03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	19.91
Exercise price range, upper range limit (in dollars per share)	$ 39.56
Number of outstanding options (in shares) | shares	867
Outstanding options, weighted average exercise price (in dollars per share)	$ 23.64
Number of options exercisable (in shares) | shares	784
Outstanding options, weighted average remaining years of contractual life (in years)	4 years 8 months 12 days
Exercisable options, weighted average remaining years of contractual life (in years)	4 years 7 months 6 days
Exercisable options, weighted average exercise price (in dollars per share)	$ 23.63