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Options and Awards Options Outstanding by Exercise Price (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 5,398
Black-Scholes Fair Value | $ $ 26,715
Stock Options Vested and Exercisable 2,795
2006  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 1.93
Exercise Price, Upper Range Limit | $ / shares $ 2.05
Number of Outstanding Options 44
Black-Scholes Fair Value | $ $ 115
Remaining Contractual Life (Years) 1 year
Stock Options Vested and Exercisable 44
2008  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 2.56
Exercise Price, Upper Range Limit | $ / shares $ 4.06
Number of Outstanding Options 457
Black-Scholes Fair Value | $ $ 675
Remaining Contractual Life (Years) 2 years
Stock Options Vested and Exercisable 457
2009  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 4.06
Exercise Price, Upper Range Limit | $ / shares $ 4.56
Number of Outstanding Options 621
Black-Scholes Fair Value | $ $ 1,329
Remaining Contractual Life (Years) 3 years
Stock Options Vested and Exercisable 621
2010  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 4.77
Exercise Price, Upper Range Limit | $ / shares $ 4.96
Number of Outstanding Options 158
Black-Scholes Fair Value | $ $ 382
Remaining Contractual Life (Years) 4 years
Stock Options Vested and Exercisable 158
2011  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 5.90
Exercise Price, Upper Range Limit | $ / shares $ 7.99
Number of Outstanding Options 194
Black-Scholes Fair Value | $ $ 657
Remaining Contractual Life (Years) 5 years
Stock Options Vested and Exercisable 158
2012  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 6.56
Exercise Price, Upper Range Limit | $ / shares $ 7.96
Number of Outstanding Options 570
Black-Scholes Fair Value | $ $ 2,101
Remaining Contractual Life (Years) 6 years
Stock Options Vested and Exercisable 338
2013  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 7.98
Exercise Price, Upper Range Limit | $ / shares $ 11.49
Number of Outstanding Options 661
Black-Scholes Fair Value | $ $ 3,227
Remaining Contractual Life (Years) 7 years
Stock Options Vested and Exercisable 312
2014  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 10.55
Exercise Price, Upper Range Limit | $ / shares $ 18.94
Number of Outstanding Options 1,790
Black-Scholes Fair Value | $ $ 10,109
Remaining Contractual Life (Years) 8 years
Stock Options Vested and Exercisable 652
2015  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 21.47
Exercise Price, Upper Range Limit | $ / shares $ 25.24
Number of Outstanding Options 616
Black-Scholes Fair Value | $ $ 5,590
Remaining Contractual Life (Years) 9 years
Stock Options Vested and Exercisable 55
2016  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit | $ / shares $ 19.58
Exercise Price, Upper Range Limit | $ / shares $ 19.89
Number of Outstanding Options 287
Black-Scholes Fair Value | $ $ 2,530
Remaining Contractual Life (Years) 10 years
Stock Options Vested and Exercisable 0