Employee Stock Benefit Plans - SBC, Total Share Return (Details)	12 Months Ended
	Dec. 31, 2019
Share-based compensation:
% of Target Earned	100.00%
Restricted stock and restricted stock units
Share-based compensation:
% of Target Earned	200.00%
Restricted stock and restricted stock units | Tranche One
Share-based compensation:
Percentile Ranking	30.00%
% of Target Earned	0.00%
Restricted stock and restricted stock units | Tranche Four
Share-based compensation:
Percentile Ranking	80.00%
% of Target Earned	200.00%
Minimum | Restricted stock and restricted stock units | Tranche Two
Share-based compensation:
Percentile Ranking	30.00%
% of Target Earned	50.00%
Minimum | Restricted stock and restricted stock units | Tranche Three
Share-based compensation:
Percentile Ranking	50.00%
% of Target Earned	100.00%
Maximum | Restricted stock and restricted stock units | Tranche Two
Share-based compensation:
Percentile Ranking	50.00%
% of Target Earned	100.00%
Maximum | Restricted stock and restricted stock units | Tranche Three
Share-based compensation:
Percentile Ranking	80.00%
% of Target Earned	200.00%