Equity Incentive Plans (Options Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of the activity of stock option awards, shares
Options outstanding, Beginning Balance , Shares	664,000
Options granted, shares	256,000	200,000.0
Options exercised, Shares	(123,000)
Options forfeited/canceled/expired, Shares	(48,000)
Options outstanding, Ending Balance , Shares	749,000	664,000
Options vested and expected to vest, Shares	716,000
Options exercisable, Shares	435,000
Summary of the activity of stock option awards, weighted average exercise price
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 23.89
Options granted, Wtd. Avg. Exercise Price	43.15
Options exercised, Wtd. Avg. Exercise Price	22.43
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	36.83
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	29.98	$ 23.89
Options vested and expected to vest, Wtd. Average Exercise Price	29.55
Options exercisable, Wtd. Avg. Exercise Price	$ 24.04
Options outstanding, Ending Balance, Wtd. Avg. Remaining Contractual Term	6 years 10 months 6 days	6 years 9 months 7 days
Options vested and expected to vest, Wtd. Avg Remaining Contractual Term	6 years 9 months 4 days
Options exercisable, Wtd. Avg. Remaining Contractual Term	5 years 6 months 7 days
Options outstanding, Beginning Balance, Average Intrinsic Value	$ 3,057	$ 10,935
Options vested and expected to vest, Aggregate Intrinsic Value	3,051
Options exercisable, Aggregate Intrinsic Value	2,951
Intrinsic value of options exercised	2,000	5,736	$ 5,564
Fair value of shares vested	$ 1,314	$ 1,095	$ 1,679