Equity Incentive Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Summary of the activity of stock option awards
Options outstanding, Beginning Balance, Shares	664
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 23.89
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term	7 years 14 days	6 years 9 months 7 days
Options outstanding, Beginning Balance, Aggregate Intrinsic Value	$ 10,935
Options granted, Shares	256
Options granted, Wtd. Avg. Exercise Price	$ 43.15
Options exercised, Shares	(109)
Options exercised, Wtd. Avg. Exercise Price	$ 22.63
Options forfeited/canceled/expired, Shares	(35)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 37.76
Options outstanding, Ending Balance, Shares	776	664
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 29.90	$ 23.89
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term	7 years 14 days	6 years 9 months 7 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value	$ 3,506	$ 10,935
Options vested and expected to vest at September 30, 2015, Shares	737
Options vested and expected to vest at September 30, 2015, Wtd. Avg. Exercise Price	$ 29.41
Options vested and expected to vest at September 30, 2015, Wtd. Avg., Remaining Contractual Term	6 years 11 months 9 days
Options vested and expected to vest at September 30, 2015, Aggregate Intrinsic Value	$ 3,498
Options exercisable at September 30, 2015, Shares	454
Options exercisable at September 30, 2015, Wtd. Avg. Exercise Price	$ 23.98
Options exercisable at September 30, 2015, Wtd. Avg. Remaining Contractual Term	5 years 8 months 12 days
Options exercisable at September 30, 2015, Aggregate Intrinsic Value	$ 3,390