Equity Incentive Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Summary of the activity of stock option awards
Options outstanding, Beginning Balance, Shares	849
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 19.67
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term	7 years 1 month 17 days	6 years 4 months 21 days
Options outstanding, Beginning Balance, Aggregate Intrinsic Value	$ 10,654
Options granted, Shares	227
Options granted, Wtd. Avg. Exercise Price	$ 32.41
Options exercised, Shares	(293)
Options exercised, Wtd. Avg. Exercise Price	$ 18.90
Options forfeited/canceled/expired, Shares	(22)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 26.37
Options outstanding, Ending Balance, Shares	761	849
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 23.57	$ 19.67
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term	7 years 1 month 17 days	6 years 4 months 21 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value	9,135	10,654
Options vested and expected to vest at June 30, 2014, Shares	725
Options vested and expected to vest at June 30, 2014, Wtd. Avg. Exercise Price	$ 23.28
Options vested and expected to vest at June 30, 2014, Wtd. Avg., Remaining Contractual Term	7 years 0 months 11 days
Options vested and expected to vest at June 30, 2014, Aggregate Intrinsic Value	8,877
Options exercisable at June 30, 2014 Shares	436
Options exercisable at June 30, 2014, Wtd. Avg. Exercise Price	$ 20.76
Options exercisable at June 30, 2014, Wtd. Avg. Remaining Contractual Term	6 years 1 month 6 days
Options exercisable at June 30, 2014, Aggregate Intrinsic Value	$ 6,437