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Stock-Based Compensation - Range of Exercise Prices (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Total intrinsic value of stock options exercised during the period | $ 4.7 | $ 2.5 | $ 2.7
Unrecognized compensation expense related to unvested stock options | $ 26.9 |  |
Expected weighted average period for recognizing unrecognized compensation expense | 2 years 6 months |  |
Performance shares |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Unrecognized compensation expense related to unvested stock options | $ 1.2 |  |
$3.03 to $3.29 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | $ 3.03 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 3.29 |  |
Number of Options outstanding (in shares) | 153,878 |  |
Weighted Average Remaining Contractual Term | 5 years 7 months 13 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 3.05 |  |
Number of Options exercisable (in shares) | 152,017 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 3.05 |  |
$3.40 to $3.40 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 3.40 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 3.40 |  |
Number of Options outstanding (in shares) | 708,314 |  |
Weighted Average Remaining Contractual Term | 6 years 8 months 9 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 3.40 |  |
Number of Options exercisable (in shares) | 531,236 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 3.40 |  |
$3.60 to $6.90 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 3.60 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 6.90 |  |
Number of Options outstanding (in shares) | 583,542 |  |
Weighted Average Remaining Contractual Term | 6 years 10 months 24 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 6.01 |  |
Number of Options exercisable (in shares) | 389,433 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 5.90 |  |
$6.96 to $12.44 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 6.96 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 12.44 |  |
Number of Options outstanding (in shares) | 693,090 |  |
Weighted Average Remaining Contractual Term | 7 years 4 months 13 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 11.36 |  |
Number of Options exercisable (in shares) | 378,156 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 11.35 |  |
$12.58 to $14.20 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 12.58 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 14.20 |  |
Number of Options outstanding (in shares) | 527,974 |  |
Weighted Average Remaining Contractual Term | 8 years 4 months 10 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 12.78 |  |
Number of Options exercisable (in shares) | 189,989 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 12.76 |  |
$14.24 to $16.07 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 14.24 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 16.07 |  |
Number of Options outstanding (in shares) | 768,900 |  |
Weighted Average Remaining Contractual Term | 8 years 5 months 23 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 15.36 |  |
Number of Options exercisable (in shares) | 161,331 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 14.46 |  |
$16.09 to $20.49 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 16.09 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 20.49 |  |
Number of Options outstanding (in shares) | 782,624 |  |
Weighted Average Remaining Contractual Term | 8 years 5 months 16 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 19.28 |  |
Number of Options exercisable (in shares) | 183,354 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 19.52 |  |
$20.92 to $22.14 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 20.92 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 22.14 |  |
Number of Options outstanding (in shares) | 106,300 |  |
Weighted Average Remaining Contractual Term | 9 years 1 month 21 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 21.54 |  |
Number of Options exercisable (in shares) | 5,625 |  |
Exercisable Options, Weighted Average Exercise Price (in dollars per share) | $ 21.54 |  |
$22.76 to $22.76 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 22.76 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 22.76 |  |
Number of Options outstanding (in shares) | 793,000 |  |
Weighted Average Remaining Contractual Term | 9 years 4 months 17 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 22.76 |  |
$22.84 to $27.38 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |
Range of Exercise Prices lower range limit (in dollars per share) | 22.84 |  |
Range of Exercise Prices upper range limit (in dollars per share) | $ 27.38 |  |
Number of Options outstanding (in shares) | 156,100 |  |
Weighted Average Remaining Contractual Term | 9 years 4 months 28 days |  |
Outstanding Options, Weighted Average Exercise Price (in dollars per share) | $ 23.76 |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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