Stock-Based Compensation (Details 3) - Nonvested shares	6 Months Ended
	Jun. 30, 2020
Compounded Annual Book Value Per Share Growth 13%
Stock-based compensation
Compounded Annual Book Value Per Share Growth	13.00%
Nonvested Common Shares Earned	10.00%
Compounded Annual Book Value Per Share Growth 13% | Maximum
Stock-based compensation
Compounded Annual Book Value Per Share Growth	13.00%
Nonvested Common Shares Earned	0.00%
Compounded Annual Book Value Per Share Growth 14%
Stock-based compensation
Compounded Annual Book Value Per Share Growth	14.00%
Nonvested Common Shares Earned	35.00%
Compounded Annual Book Value Per Share Growth 15%
Stock-based compensation
Compounded Annual Book Value Per Share Growth	15.00%
Nonvested Common Shares Earned	60.00%
Compounded Annual Book Value Per Share Growth 16%
Stock-based compensation
Compounded Annual Book Value Per Share Growth	16.00%
Nonvested Common Shares Earned	85.00%
Compounded Annual Book Value Per Share Growth 17% | Minimum
Stock-based compensation
Compounded Annual Book Value Per Share Growth	17.00%
Nonvested Common Shares Earned	100.00%