Employee Benefit Plans - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) plan hour	Dec. 31, 2017 USD ($)	Jun. 30, 2012 USD ($) quarter	Jun. 30, 2018 USD ($)	Jan. 05, 2015 USD ($)	Nov. 18, 2014 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension settlement charge	$ 10,948,000	$ 0	$ 10,948,000	$ 0
Multiemployer plans, number of plans | plan			2
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits			$ 24,400,000
Pension Withdrawal Expense, After Tax			8,100,000
Other Commitment, Due after Fifth Year	$ 200,000		$ 200,000
Defined contribution plan, hours threshold for eligibility | hour			1,000
Defined contribution plan, employer matching contribution percent	100.00%		50.00%
Defined contribution plan, employer matching contribution, percent of eligible income	4.00%		6.00%
Defined contribution plan, employer matching contribution, annual vesting percent			20.00%
Defined contribution plan, vesting period			5 years
Defined Contribution Plan, Employer Matching Contribution, Amount	$ 400,000	500,000	$ 900,000	1,000,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan			$ 6,700,000
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment horizon for long-term capital market assumptions			20 years
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment horizon for long-term capital market assumptions			30 years
Brewmatic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	114,100,000		$ 114,100,000
Defined Benefit Plan, Fair Value of Plan Assets	67,400,000		67,400,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan	46,700,000		46,700,000
WCTPP [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plans, Withdrawal Obligation, Assessment	3,400,000		3,400,000
Withdrawal obligation	2,600,000		2,600,000
Labor Management Pension Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Withdrawal obligation					$ 4,300,000	$ 3,800,000	$ 4,900,000	$ 4,400,000
Multiemployer plan, quarterly installments for withdrawal liability					$ 100,000
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter					80
Local 807 Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			3,000,000
Multiemployer plan, quarterly installments for withdrawal liability			$ 91,000
Other Postretirement Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans | plan			9
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension settlement charge	$ 10,948,000	$ 0	$ 10,948,000	$ 0
Multiemployer Plans, Pension | Multiemployer Plans, Defined Benefit Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans | plan			2
Multiemployer Plans, Pension | Multiemployer Plans, Defined Contribution Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plans, number of plans | plan			1
Employee-related | WCTPP [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			$ 153,822
Multiemployer plan, quarterly installments for withdrawal liability			$ 190,507