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Commitments and Contingencies Disclosure (Tables)
 3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Activity in Environmental Liability
Activity in the environmental liability is as follows:
 
(in thousands)
Balance at Beginning of the Period
 
Additions to Accrual
 
Expenditures for Remediation
 
Balance at Period-end
Year ended December 31, 2017
$
12,770

 
$
—

 
$
(7,791
)
 
$
4,979

Year ended December 31, 2018
4,979

 
5,600

 
(1,496
)
 
9,083

Quarter ended March 31, 2019
9,083

 
—

 
(158
)
 
8,925