Stockholders' Equity - Equity-based Compensation, Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld for taxes	7,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld for taxes	7,365
Vested in period, fair value	$ 2.1
Nonvested Restricted Stock, Number of Shares [Roll Forward]
Nonvested outstanding at the beginning of the period, shares		92,465
Granted, shares	62,015		0
Vested, shares	(27,628)	0	0
Forfeited, shares	(4,129)
Nonvested outstanding at the end of the period, shares		122,723
Nonvested Restricted Stock, Weighted Average Grant Date Fair Value [Abstract]
Nonvested outstanding at the beginning of the period	$ 52.98
Granted	80.59	$ 52.99
Vested	51.53
Forfeited	60.58
Nonvested outstanding at the end of the period	$ 67.01	$ 52.98
Unrecognized stock-based compensation expense	$ 6.5
Compensation cost not yet recognized, period	3 years
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	1 year
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	4 years