Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details 1)

v3.6.0.2
BENEFIT PLANS - Fair Value of Plan Assets (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year $ 594,217  
Employer Contributions 150,000  
Fair value of plan assets at end of measurement year 745,725 $ 594,217
Pension Benefits    
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year 594,217 653,013
Actual return on plan assets 39,895 (16,122)
Employer Contributions 150,000 0
Settlements (20,081) (25,428)
Benefits paid (18,306) (17,246)
Total changes 151,508 (58,796)
Fair value of plan assets at end of measurement year $ 745,725 $ 594,217