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Options and Awards - Options Outstanding by Exercise Price (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Number outstanding (in shares) 4,038
Black-Scholes Fair Value | $ $ 41,496
Stock options vested and exercisable (in shares) 2,148
2011  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 5.00
Exercise price, upper range limit (in dollars per share) | $ / shares $ 6.77
Number outstanding (in shares) 38
Black-Scholes Fair Value | $ $ 86
Remaining Contractual Life (Years) 1 year
Stock options vested and exercisable (in shares) 38
2012  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 5.56
Exercise price, upper range limit (in dollars per share) | $ / shares $ 6.75
Number outstanding (in shares) 126
Black-Scholes Fair Value | $ $ 390
Remaining Contractual Life (Years) 2 years
Stock options vested and exercisable (in shares) 126
2013  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 6.76
Exercise price, upper range limit (in dollars per share) | $ / shares $ 9.74
Number outstanding (in shares) 177
Black-Scholes Fair Value | $ $ 762
Remaining Contractual Life (Years) 3 years
Stock options vested and exercisable (in shares) 177
2014  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 8.94
Exercise price, upper range limit (in dollars per share) | $ / shares $ 16.05
Number outstanding (in shares) 722
Black-Scholes Fair Value | $ $ 3,450
Remaining Contractual Life (Years) 4 years
Stock options vested and exercisable (in shares) 722
2015  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 18.20
Exercise price, upper range limit (in dollars per share) | $ / shares $ 21.39
Number outstanding (in shares) 328
Black-Scholes Fair Value | $ $ 2,546
Remaining Contractual Life (Years) 5 years
Stock options vested and exercisable (in shares) 328
2016  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 15.93
Exercise price, upper range limit (in dollars per share) | $ / shares $ 16.86
Number outstanding (in shares) 312
Black-Scholes Fair Value | $ $ 1,841
Remaining Contractual Life (Years) 6 years
Stock options vested and exercisable (in shares) 234
2017  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 15.80
Exercise price, upper range limit (in dollars per share) | $ / shares $ 19.41
Number outstanding (in shares) 363
Black-Scholes Fair Value | $ $ 2,143
Remaining Contractual Life (Years) 7 years
Stock options vested and exercisable (in shares) 183
2018  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 22.49
Exercise price, upper range limit (in dollars per share) | $ / shares $ 32.71
Number outstanding (in shares) 594
Black-Scholes Fair Value | $ $ 6,109
Remaining Contractual Life (Years) 8 years
Stock options vested and exercisable (in shares) 208
2019  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 41.07
Exercise price, upper range limit (in dollars per share) | $ / shares $ 45.76
Number outstanding (in shares) 723
Black-Scholes Fair Value | $ $ 11,342
Remaining Contractual Life (Years) 9 years
Stock options vested and exercisable (in shares) 132
2020  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price, lower range limit (in dollars per share) | $ / shares $ 44.84
Exercise price, upper range limit (in dollars per share) | $ / shares $ 59.49
Number outstanding (in shares) 655
Black-Scholes Fair Value | $ $ 12,827
Remaining Contractual Life (Years) 10 years
Stock options vested and exercisable (in shares) 0