Equity Incentive Plans (Options by Exercise Price) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	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 (in dollars per share)	$ 2.09	$ 4.26	$ 2.92
Options granted, shares	295	300	200
Exercise prices and related information of stock option outstanding
Options outstanding, number outstanding (in shares)	807
Options outstanding, Wtd. Avg. remaining contractual life	7 years 1 month 21 days
Options outstanding, Wtd. Avg. exercise price (in dollars per share)	$ 30.97
Options exercisable, Number exercisable (in shares)	414
Options exercisable Wtd. Avg. Remaining Contractual Life	5 years 9 months 22 days
Options exercisable, Wtd. Avg. exercise price (in dollars per share)	$ 27.97
0-18.23
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price (in dollars per share)	0
Upper range limit, Exercise price (in dollars per share)	$ 18.23
Options outstanding, number outstanding (in shares)	51
Options outstanding, Wtd. Avg. remaining contractual life	2 years 8 months 16 days
Options outstanding, Wtd. Avg. exercise price (in dollars per share)	$ 17.54
Options exercisable, Number exercisable (in shares)	51
Options exercisable Wtd. Avg. Remaining Contractual Life	2 years 8 months 16 days
Options exercisable, Wtd. Avg. exercise price (in dollars per share)	$ 17.54
18.24-22.26
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price (in dollars per share)	18.24
Upper range limit, Exercise price (in dollars per share)	$ 22.26
Options outstanding, number outstanding (in shares)	122
Options outstanding, Wtd. Avg. remaining contractual life	3 years 8 months 9 days
Options outstanding, Wtd. Avg. exercise price (in dollars per share)	$ 21.14
Options exercisable, Number exercisable (in shares)	122
Options exercisable Wtd. Avg. Remaining Contractual Life	3 years 8 months 9 days
Options exercisable, Wtd. Avg. exercise price (in dollars per share)	$ 21.14
22.27-29.39
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price (in dollars per share)	22.27
Upper range limit, Exercise price (in dollars per share)	$ 29.39
Options outstanding, number outstanding (in shares)	296
Options outstanding, Wtd. Avg. remaining contractual life	8 years 7 months 24 days
Options outstanding, Wtd. Avg. exercise price (in dollars per share)	$ 28.32
Options exercisable, Number exercisable (in shares)	89
Options exercisable Wtd. Avg. Remaining Contractual Life	7 years 4 months 17 days
Options exercisable, Wtd. Avg. exercise price (in dollars per share)	$ 25.86
29.40-43.15
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price (in dollars per share)	32.41
Upper range limit, Exercise price (in dollars per share)	$ 43.15
Options outstanding, number outstanding (in shares)	338
Options outstanding, Wtd. Avg. remaining contractual life	7 years 8 months 27 days
Options outstanding, Wtd. Avg. exercise price (in dollars per share)	$ 38.83
Options exercisable, Number exercisable (in shares)	152
Options exercisable Wtd. Avg. Remaining Contractual Life	7 years 7 months 21 days
Options exercisable, Wtd. Avg. exercise price (in dollars per share)	$ 38.18