XML 35 R24.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2015
$
21,651

 
$
—

 
$
4,890

 
$
16,761

Year ended December 31, 2016
16,761

 
7,700

 
11,691

 
12,770

Quarter ended March 31, 2017
12,770

 
—

 
3,329

 
9,441

Quarter ended June 30, 2017
9,441

 
—

 
951

 
8,490

Quarter ended September 30, 2017
$
8,490

 
$
—

 
$
1,900

 
$
6,590