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Equity Compensation (Range) (Details)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Options Outstanding  
Number of Underlying Shares | shares 1,045,240
Options Exercisable  
Number of Underlying Shares | shares 1,010,354
4.89-7.49  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 4.89
Range of Exercise Price, high end of range (in dollars per share) 7.49
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 6.22
Number of Underlying Shares | shares 269,614
Weighted-Average Remaining Contractual Life 2 years 4 months 24 days
Options Exercisable  
Number of Underlying Shares | shares 267,480
Weighted-Average Remaining Contractual Life 2 years 3 months 18 days
8.16-12.93  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 8.16
Range of Exercise Price, high end of range (in dollars per share) 12.93
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 10.57
Number of Underlying Shares | shares 274,926
Weighted-Average Remaining Contractual Life 4 years 10 months 24 days
Options Exercisable  
Number of Underlying Shares | shares 242,174
Weighted-Average Remaining Contractual Life 4 years 9 months 18 days
12.98-19.56  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 12.98
Range of Exercise Price, high end of range (in dollars per share) 19.56
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 15.60
Number of Underlying Shares | shares 270,481
Weighted-Average Remaining Contractual Life 5 years 7 months 6 days
Options Exercisable  
Number of Underlying Shares | shares 270,481
Weighted-Average Remaining Contractual Life 5 years 7 months 6 days
20.91-22.92  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 20.91
Range of Exercise Price, high end of range (in dollars per share) 22.92
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 21.16
Number of Underlying Shares | shares 230,219
Weighted-Average Remaining Contractual Life 4 years 9 months 18 days
Options Exercisable  
Number of Underlying Shares | shares 230,219
Weighted-Average Remaining Contractual Life 4 years 9 months 18 days