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Equity Compensation Plans - Outstanding and Exercisable Options (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
Mar. 31, 2018
USD ($)
$ / shares
shares
Shares  
Outstanding (shares) | shares 417
Exercisable (shares) | shares 207
Unvested (shares) | shares 210
Weighted- Average Exercise Price  
Outstanding (USD per share) | $ / shares $ 34.36
Exercisable (USD per share) | $ / shares 21.90
Unvested (USD per share) | $ / shares $ 46.64
Aggregate Intrinsic Value  
Outstanding | $ $ 6,732
Exercisable | $ 5,611
Unvested | $ $ 1,121