Stock-Based Compensation, Non-Vested Stock Option Activity (Details) - Stock Options	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Status of the Company's non-vested options and changes during the year
Non-vested options at the beginning of the period (in shares) | shares	19,016,830
Non-vested options, options granted (in shares) | shares	0
Non-vested options, options vested (in shares) | shares	(67,920)
Non-vested options, options forfeited (in shares) | shares	(90,070)
Non-vested options at the end of the period (in shares) | shares	18,858,840
Weighted Average Fair Value at Grant Date
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 10.72
Weighted average fair value at grant date, options granted (in dollars per share) | $ / shares	0
Weighted average fair value at grant date, options vested (in dollars per share) | $ / shares	8.62
Weighted average fair value at grant date, options forfeited (in dollars per share) | $ / shares	10.89
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) | $ / shares	$ 10.73