- Actuarial Weighted Average Assumptions Used in Determining Net Periodic Pension Cost (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Discount rate		4.31%	3.75%	4.00%
Rate of compensation increase	[1]	0.00%	0.00%	0.00%
Expected return on assets		4.80%	7.50%	7.50%

[1] Rate of compensation increase is not applicable for 2019, 2018 and 2017 due to the amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016.