Mezzanine and Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Holdback shares not issued to former shareholders (in shares)		302,732
Stock options exercised (in shares)		120,000	111,000
Options exercised (in shares)		0	0
Options outstanding exercise price (in dollars per share)	$ 10.86	$ 10.86		$ 9.22
Share-based compensation		$ 1,910	$ 676
Warrants exercised (in shares)		273,900	41,624
Proceeds from warrants exercised		$ 2,600	$ 400
Treasury shares (in shares)	17,475,707	17,475,707		17,458,810
Allied Pacific of California Brokerage Account
Class of Stock [Line Items]
Treasury stock, value	$ 7,600	$ 7,600
APC
Class of Stock [Line Items]
Treasury shares (in shares)	17,307,214	17,307,214		17,290,317
Dividends declared		$ 29,600	10,000
CDSC
Class of Stock [Line Items]
Dividends declared		600	$ 1,200
Restricted stock awards
Class of Stock [Line Items]
Share-based compensation	$ 900	1,600
Unrecognized compensation expense	3,800	$ 3,800
Restricted stock awards
Class of Stock [Line Items]
Vesting period		3 years
Restricted stock awards granted (in shares)		97,447
Weighted average grant date fair value (in dollars per share)		$ 17.58
Grant date fair value of restricted stock to be recognized straight-line	$ 1,600	$ 1,600
Minimum
Class of Stock [Line Items]
Exercise price of exercises during period (in dollars per share)	$ 2.10	$ 2.10	$ 1.50
Exercise price of warrants exercised (in dollars per share)		9.00	9.00
Maximum
Class of Stock [Line Items]
Exercise price of exercises during period (in dollars per share)	5.00	5.00	5.79
Exercise price of warrants exercised (in dollars per share)		$ 11.00	$ 11.00
APC Stock Option
Class of Stock [Line Items]
Proceeds of options exercised		$ 300	$ 500
Board Members
Class of Stock [Line Items]
Options granted (in shares)		11,742
Options outstanding exercise price (in dollars per share)	$ 18.41	$ 18.41
Board Members | Stock options
Class of Stock [Line Items]
Vesting period		5 years