Equity Incentive Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 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
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	7 years 3 months 11 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	(92)
Options exercised, Wtd. Avg. Exercise Price	$ 22.80
Options forfeited/canceled/expired, Shares	(18)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 36.85
Options outstanding, Ending Balance, Shares	810	664
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 29.82	$ 23.89
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	7 years 3 months 11 days	6 years 9 months 7 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value	$ 5,728	$ 10,935
Options vested and expected to vest at June 30, 2015, Shares	762
Options vested and expected to vest at June 30, 2015, Wtd. Avg. Exercise Price	$ 29.28
Options vested and expected to vest at June 30, 2015, Wtd. Avg., Remaining Contractual Term	7 years 2 months 1 day
Options vested and expected to vest at June 30, 2015, Aggregate Intrinsic Value	$ 5,670
Options exercisable at June 30, 2015, Shares	461
Options exercisable at June 30, 2015, Wtd. Avg. Exercise Price	$ 24.01
Options exercisable at June 30, 2015, Wtd. Avg. Remaining Contractual Term	5 years 11 months 12 days
Options exercisable at June 30, 2015, Aggregate Intrinsic Value	$ 5,125