Retirement Plans, Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost, Pension Benefits (Details)		3 Months Ended	9 Months Ended	12 Months Ended
		Apr. 11, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	[1]	4.20%	4.00%		4.50%	4.10%
Expected long-term rate of return on plan assets				7.00%	7.00%	7.50%
Rate of compensation increase						4.25%
SERP [Member]
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	[1]			4.20%	4.50%	4.10%
Expected long-term rate of return on plan assets				0.00%	0.00%	0.00%
Rate of compensation increase				0.00%	0.00%	0.00%

[1] The 2017 benefit cost for the pension plan was determined using a discount rate of 4.2% for the period beginning January 1, 2017 and ending April 11, 2017 and 4.0% for the period beginning April 12, 2017 and ending December 31, 2017.