Equity Incentive Plans (Options by Exercise Price) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Granted, Wtd. Avg. grant date fair value	$ 4.26	$ 2.92
Exercise prices and related information of stock option outstanding
Options outstanding, number outstanding	749
Options outstanding, Wtd. Avg. remaining contractual life	6 years 10 months 6 days
Options outstanding, Wtd. Avg. exercise price	$ 29.98
Options exercisable, Number exercisable	435
Options exercisable Wtd. Avg. Remaining Contractual Life	5 years 6 months 7 days
Options exercisable, Wtd. Avg. exercise price	$ 24.04
13.72-18.23
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	13.72
Upper range limit, Exercise price	$ 18.23
Options outstanding, number outstanding	91
Options outstanding, Wtd. Avg. remaining contractual life	3 years 7 months 13 days
Options outstanding, Wtd. Avg. exercise price	$ 17.29
Options exercisable, Number exercisable	91
Options exercisable Wtd. Avg. Remaining Contractual Life	3 years 7 months 13 days
Options exercisable, Wtd. Avg. exercise price	$ 17.29
18.65-22.26
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	18.65
Upper range limit, Exercise price	$ 22.26
Options outstanding, number outstanding	200
Options outstanding, Wtd. Avg. remaining contractual life	4 years 9 months
Options outstanding, Wtd. Avg. exercise price	$ 21.14
Options exercisable, Number exercisable	200
Options exercisable Wtd. Avg. Remaining Contractual Life	4 years 9 months 4 days
Options exercisable, Wtd. Avg. exercise price	$ 21.14
22.30-32.41
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	22.30
Upper range limit, Exercise price	$ 32.41
Options outstanding, number outstanding	227
Options outstanding, Wtd. Avg. remaining contractual life	7 years 7 months 28 days
Options outstanding, Wtd. Avg. exercise price	$ 29.38
Options exercisable, Number exercisable	96
Options exercisable Wtd. Avg. Remaining Contractual Life	7 years 2 months 27 days
Options exercisable, Wtd. Avg. exercise price	$ 27.05
32.41-43.15
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	32.41
Upper range limit, Exercise price	$ 43.15
Options outstanding, number outstanding	231
Options outstanding, Wtd. Avg. remaining contractual life	9 years 1 month 17 days
Options outstanding, Wtd. Avg. exercise price	$ 43.15
Options exercisable, Number exercisable	48
Options exercisable Wtd. Avg. Remaining Contractual Life	8 years 11 months 12 days
Options exercisable, Wtd. Avg. exercise price	$ 43.15