Shareholders' Equity - Expense, Options (Details) - USD ($)	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2018	Oct. 21, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Incentive plans
Share-based compensation expense		$ 1,200,000	$ 4,900,000	$ 2,000,000
Share compensation, income tax benefit	$ 439,000		$ 1,399,000	439,000
Number of Units
Granted			0
Weighted Average Exercise Price
Options vested in period, fair value			$ 6,431	$ 3,698
Unrecognized compensation cost related to nonvested options			$ 2,200,000
Options
Weighted Average Exercise Price
Unrecognized compensation cost, recognition period			8 years 8 months 12 days
Equity Incentive Plan 2018 [Member]
Number of Units
Outstanding at the beginning of period			178,600
Granted			0	179,700
Expired / Forfeited			(44,400)	(1,100)
Outstanding at at the end of period	178,600		134,200	178,600
Weighted Average Exercise Price
Granted				$ 7.00
Expired / Forfeited			$ 7.00	$ 7.00
Options outstanding, weighted average contractual term			8 years 8 months 12 days	9 years 9 months 18 days
Weighted average grant date fair value of options granted				$ 3.82
Equity Incentive Plan 2018 [Member] | Time
Number of Units
Outstanding at the beginning of period			178,600
Granted				179,700
Expired / Forfeited			(44,400)	(1,100)
Outstanding at at the end of period	178,600		134,200	178,600
2016 Equity Incentive Plan
Number of Units
Outstanding at the beginning of period	70,400	72,200	3,015,572	72,200
Granted			0
Expired / Forfeited		(1,800)	(55,686)
Unit options converted to share options	3,015,572
Outstanding at at the end of period	3,015,572	70,400	2,959,886	3,015,572	72,200
Vested options at end of period, number	720,131		1,459,005	720,131
Weighted Average Exercise Price
Outstanding at the beginning of period	$ 641
Expired / Forfeited		$ 640
Unit options converted to share options	14.96
Performance options modified to time options	14.96
Outstanding at at the end of period		$ 641
Vested options at the end of period, exercise price	$ 14.96		$ 14.96	$ 14.96
Options outstanding, weighted average contractual term			6 years 4 months 26 days	7 years 6 months	8 years 3 months 18 days
Options vested, weighted average contractual term			6 years 4 months 26 days	7 years 4 months 26 days
Weighted average grant date fair value of options granted				$ 184.69
Options outstanding, intrinsic value			$ 0
2016 Equity Incentive Plan | Time
Number of Units
Outstanding at the beginning of period	35,200	36,100	3,015,572	36,100
Expired / Forfeited		(900)	(55,686)
Unit options converted to share options	1,507,786
Performance options modified to time options	1,507,786
Outstanding at at the end of period	3,015,572	35,200	2,959,886	3,015,572	36,100
Vested options at end of period, number	720,131		1,459,005	720,131
2016 Equity Incentive Plan | Performance
Number of Units
Outstanding at the beginning of period	35,200	36,100		36,100
Expired / Forfeited		(900)
Unit options converted to share options	1,507,786
Performance options modified to time options	(1,507,786)
Outstanding at at the end of period		35,200			36,100