Equity Incentive Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 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 28 days	6 years 4 months 21 days
Options outstanding, Beginning Balance, Aggregate Intrinsic Value	$ 10,654
Options granted, Shares	223
Options granted, Wtd. Avg. Exercise Price	$ 32.41
Options exercised, Shares	(177)
Options exercised, Wtd. Avg. Exercise Price	$ 19.00
Options forfeited/canceled/expired, Shares	(7)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 32.17
Options outstanding, Ending Balance, Shares	888	849
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 22.99	$ 19.67
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term	7 years 1 month 28 days	6 years 4 months 21 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value	8,309	10,654
Options vested and expected to vest at March 31, 2014, Shares	852
Options vested and expected to vest at March 31, 2014, Wtd. Avg. Exercise Price	$ 22.67
Options vested and expected to vest at March 31, 2014, Wtd. Avg., Remaining Contractual Term	7 years 0 months 22 days
Options vested and expected to vest at March 31, 2014, Aggregate Intrinsic Value	8,173
Options exercisable at March 31, 2014 Shares	545
Options exercisable at March 31, 2014, Wtd. Avg. Exercise Price	$ 20.29
Options exercisable at March 31, 2014, Wtd. Avg. Remaining Contractual Term	6 years 2 months 1 day
Options exercisable at March 31, 2014, Aggregate Intrinsic Value	$ 6,515