Equity Incentive Plans (Options Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of the activity of stock option awards, shares
Options outstanding, Beginning Balance , Shares	749
Options granted, shares	295	300	200
Options exercised, Shares	(155)
Options forfeited/canceled/expired, Shares	(82)
Options outstanding, Ending Balance , Shares	807	749
Options vested and expected to vest, Shares	769
Options exercisable, Shares	414
Summary of the activity of stock option awards, weighted average exercise price
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price (in dollars per share)	$ 29.98
Options granted, Wtd. Avg. Exercise Price (in dollars per share)	29.39
Options exercised, Wtd. Avg. Exercise Price (in dollars per share)	21.07
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price (in dollars per share)	35.00
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price (in dollars per share)	30.97	$ 29.98
Options vested and expected to vest, Wtd. Average Exercise Price (in dollars per share)	30.85
Options exercisable, Wtd. Avg. Exercise Price (in dollars per share)	$ 27.97
Options outstanding, Ending Balance, Wtd. Avg. Remaining Contractual Term	7 years 1 month 21 days	6 years 10 months 6 days
Options vested and expected to vest, Wtd. Avg Remaining Contractual Term	7 years 22 days
Options exercisable, Wtd. Avg. Remaining Contractual Term	5 years 9 months 22 days
Options outstanding, Beginning Balance, Average Intrinsic Value	$ 5,466	$ 3,057
Options vested and expected to vest, Aggregate Intrinsic Value	5,292
Options exercisable, Aggregate Intrinsic Value	3,885
Intrinsic value of options exercised	1,671	2,000	$ 5,736
Fair value of shares vested	$ 518	$ 1,314	$ 1,095