XML 55 R45.htm IDEA: XBRL DOCUMENT v3.8.0.1
EMPLOYEE BENEFIT PLANS- Net periodic benefit cost (credit) and related components (Details) - Multiple employer pension plan - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Multiemployer Plans [Line Items]        
Interest cost $ 66 $ 68 $ 198 $ 205
Expected return on plan assets (103) (101) (310) (304)
Amortization of net losses 22 21 68 63
Net periodic benefit $ (15) $ (12) $ (44) $ (36)