Equity Incentive Plans (Options by Exercise Price) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Granted, Wtd. Avg. grant date fair value	$ 2.92
Exercise prices and related information of stock option outstanding
Options outstanding, Number outstanding	664,000
Options outstanding, Wtd. Avg. remaining contractual life	6 years 9 months 7 days
Options outstanding, Wtd. Avg. exercise price	$ 23.89
Options exercisable, Number exercisable	363,000
Options exercisable Wtd. Avg. Remaining Contractual Life	5 years 8 months 27 days
Options exercisable, Wtd. Avg. exercise price	$ 20.82
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	111,000
Options outstanding, Wtd. Avg. remaining contractual life	4 years 7 months 21 days
Options outstanding, Wtd. Avg. exercise price	$ 17.38
Options exercisable, Number exercisable	111,000
Options exercisable Wtd. Avg. Remaining Contractual Life	4 years 7 months 21 days
Options exercisable, Wtd. Avg. exercise price	$ 17.38
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	285,000
Options outstanding, Wtd. Avg. remaining contractual life	5 years 9 months 7 days
Options outstanding, Wtd. Avg. exercise price	$ 21.13
Options exercisable, Number exercisable	188,000
Options exercisable Wtd. Avg. Remaining Contractual Life	5 years 6 months 22 days
Options exercisable, Wtd. Avg. exercise price	$ 21.00
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	268,000
Options outstanding, Wtd. Avg. remaining contractual life	8 years 8 months 12 days
Options outstanding, Wtd. Avg. exercise price	$ 29.55
Options exercisable, Number exercisable	64,000
Options exercisable Wtd. Avg. Remaining Contractual Life	8 years 2 months 5 days
Options exercisable, Wtd. Avg. exercise price	$ 26.25