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Share-Based Compensation - Significant Ranges of Outstanding and Exercisable Options (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) $ 9.1
Range of Exercise prices, upper range limit (usd per share) $ 52.60
Options outstanding as of December 31, 2014 (shares) | shares 599,973
Weighted average remaining contractual life (years) 8 years 18 days
Weighted average exercise price (usd per share) $ 12.68
Options exercisable as of December 31, 2014 (shares) | shares 219,956
Weighted average exercise price of exercisable options (usd per share) $ 15.57
$9.10 - $9.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 9.10
Range of Exercise prices, upper range limit (usd per share) $ 9.20
Options outstanding as of December 31, 2014 (shares) | shares 21,998
Weighted average remaining contractual life (years) 6 years 10 months 10 days
Weighted average exercise price (usd per share) $ 9.12
Options exercisable as of December 31, 2014 (shares) | shares 18,609
Weighted average exercise price of exercisable options (usd per share) $ 9.10
$9.63 - $9.63  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 9.63
Range of Exercise prices, upper range limit (usd per share) $ 9.63
Options outstanding as of December 31, 2014 (shares) | shares 155,636
Weighted average remaining contractual life (years) 8 years 3 months 4 days
Weighted average exercise price (usd per share) $ 9.63
Options exercisable as of December 31, 2014 (shares) | shares 64,315
Weighted average exercise price of exercisable options (usd per share) $ 9.63
$9.72 - $10.55  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 9.72
Range of Exercise prices, upper range limit (usd per share) $ 10.55
Options outstanding as of December 31, 2014 (shares) | shares 14,007
Weighted average remaining contractual life (years) 5 years 7 months 2 days
Weighted average exercise price (usd per share) $ 10.06
Options exercisable as of December 31, 2014 (shares) | shares 12,675
Weighted average exercise price of exercisable options (usd per share) $ 10.09
$10.95 - $10.95  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 10.95
Range of Exercise prices, upper range limit (usd per share) $ 10.95
Options outstanding as of December 31, 2014 (shares) | shares 225,650
Weighted average remaining contractual life (years) 9 years 5 months 1 day
Weighted average exercise price (usd per share) $ 10.95
Options exercisable as of December 31, 2014 (shares) | shares 0
Weighted average exercise price of exercisable options (usd per share) $ 0.00
$12.12 - $13.40  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 12.12
Range of Exercise prices, upper range limit (usd per share) $ 13.40
Options outstanding as of December 31, 2014 (shares) | shares 63,416
Weighted average remaining contractual life (years) 8 years 4 months 17 days
Weighted average exercise price (usd per share) $ 12.78
Options exercisable as of December 31, 2014 (shares) | shares 30,086
Weighted average exercise price of exercisable options (usd per share) $ 12.94
$13.46 - $14.51  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 13.46
Range of Exercise prices, upper range limit (usd per share) $ 14.51
Options outstanding as of December 31, 2014 (shares) | shares 81,030
Weighted average remaining contractual life (years) 6 years 9 months 22 days
Weighted average exercise price (usd per share) $ 14.27
Options exercisable as of December 31, 2014 (shares) | shares 57,701
Weighted average exercise price of exercisable options (usd per share) $ 14.23
$16.80 - $27.60  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 16.80
Range of Exercise prices, upper range limit (usd per share) $ 27.60
Options outstanding as of December 31, 2014 (shares) | shares 19,461
Weighted average remaining contractual life (years) 4 years 9 months
Weighted average exercise price (usd per share) $ 23.79
Options exercisable as of December 31, 2014 (shares) | shares 17,795
Weighted average exercise price of exercisable options (usd per share) $ 24.18
$29.80 - $29.80  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 29.80
Range of Exercise prices, upper range limit (usd per share) $ 29.80
Options outstanding as of December 31, 2014 (shares) | shares 4,150
Weighted average remaining contractual life (years) 11 months 3 days
Weighted average exercise price (usd per share) $ 29.80
Options exercisable as of December 31, 2014 (shares) | shares 4,150
Weighted average exercise price of exercisable options (usd per share) $ 29.80
$32.00 - $32.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 32.00
Range of Exercise prices, upper range limit (usd per share) $ 32.00
Options outstanding as of December 31, 2014 (shares) | shares 1,200
Weighted average remaining contractual life (years) 1 year 3 months 29 days
Weighted average exercise price (usd per share) $ 32.00
Options exercisable as of December 31, 2014 (shares) | shares 1,200
Weighted average exercise price of exercisable options (usd per share) $ 32.00
$52.60 - $52.60  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 52.60
Range of Exercise prices, upper range limit (usd per share) $ 52.60
Options outstanding as of December 31, 2014 (shares) | shares 13,425
Weighted average remaining contractual life (years) 6 months 15 days
Weighted average exercise price (usd per share) $ 52.60
Options exercisable as of December 31, 2014 (shares) | shares 13,425
Weighted average exercise price of exercisable options (usd per share) $ 52.60