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Stock Plans - Unrecognized Share-based Compensation Costs (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 28,919
Weighted Average Period Expected to be Recognized 2 years 6 months
Stock option Awards  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 660
Weighted Average Period Expected to be Recognized 7 months 6 days
Vested  
Number of Shares | shares 1,449,000
Weighted Average Exercise Price | $ / shares $ 35.39
Weighted Average Remaining Contractual Life 4 years 10 months 24 days
Aggregate Intrinsic Value $ 39
Expected to vest  
Number of shares | shares 127,000
Weighted Average Exercise Price | $ / shares $ 32.79
Weighted Average Remaining Contractual Life 5 years 1 month 6 days
Total  
Number of shares | shares 1,576,000
Weighted Average Exercise Price | $ / shares $ 35.18
Weighted Average Remaining Contractual Life 4 years 10 months 24 days
Aggregate Intrinsic Value $ 39
Closing price | $ / shares $ 29.15
Restricted stock units  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 3,034
Weighted Average Period Expected to be Recognized 2 years
Restricted Stock Awards  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 20,669
Weighted Average Period Expected to be Recognized 2 years 8 months 12 days
Performance Share Units  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 4,556
Weighted Average Period Expected to be Recognized 2 years 6 months