Commitments and Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
ACP [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Minimum	$ 440
Loss Contingency, Range of Possible Loss, Maximum	1,100
Loss Contingency Accrual At Carrying Value	$ 315	$ 173
P-2 Well Operation Range Estimate	fifteen months to thirty nine months
SB Decking [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 3,800
Loss Contingency, Settlement Agreement, Terms	In response, two of the three carriers entered into separate settlement and release agreements with the subsidiary in 2005 and 2007 for $15,000 and $20,000, respectively. The proceeds of both settlements are restricted and can only be used to pay claims and costs of defense associated with the subsidiary’s asbestos litigation. In 2007, the subsidiary and the remaining primary insurance carrier entered into a Claim Handling and Funding Agreement, under which the carrier is paying 27% of defense and indemnity costs incurred by or on behalf of the subsidiary in connection with asbestos bodily injury claims. The agreement continues until terminated and can only be terminated by either party by providing a minimum of two years prior written notice. As of September 30, 2015, no notice of termination has been given under this agreement. At the end of the term of the agreement, the subsidiary may choose to again pursue its claim against this insurer regarding the application of the policy limits.
VAT Assessment [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			$ 796
VAT Total [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Minimum	$ 0
Loss Contingency, Range of Possible Loss, Maximum	$ 2,600
Percentage of Potential Exposure Represented by One Jurisdiction	85.00%