Debt and Capital Lease Obligations - Schedule of Long-term Debt and Capital Lease Obligations (Parenthetical) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Interest rate on credit facility	3.80%	3.10%
Weighted interest rate on long term debt	4.30%	3.80%
Current revolving credit facility maturity period	1 year	1 year
Brewster Inc. Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate on credit facility	3.20%