Employee Stock Benefit Plans - Share-based Compensation, by Incentive Plan (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation:
Shares Authorized	116,627,000
Shares Available for Grant	23,441,000
Stock Options Outstanding	4,946,000	5,935,000
Non-vested Restricted Stock and Restricted Stock Units	10,389,000	9,906,000
Options assumed from acquisition
Share-based compensation:
Shares Authorized	2,227,000
Shares Available for Grant	296,000
Stock Options Outstanding	219,000
Non-vested Restricted Stock and Restricted Stock Units
2006 Incentive Plan
Share-based compensation:
Shares Authorized	71,669,000
Shares Available for Grant
Stock Options Outstanding	3,650,000
Non-vested Restricted Stock and Restricted Stock Units	34,000
2015 Incentive Plan
Share-based compensation:
Shares Authorized	42,731,000
Shares Available for Grant	23,145,000
Stock Options Outstanding	1,077,000
Non-vested Restricted Stock and Restricted Stock Units	10,355,000