Annual report pursuant to Section 13 and 15(d)

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

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BENEFIT PLANS BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year $ 653,013  
Fair value of plan assets at end of measurement year 594,217 $ 653,013
Pension Benefits    
Change in Fair Value of Plan Assets [Abstract]    
Fair value of plan assets at beginning of measurement year 653,013 649,020
Actual return on plan assets (16,122) 44,312
Settlements (25,428) (24,098)
Benefits paid (17,246) (16,221)
Total changes (58,796) 3,993
Fair value of plan assets at end of measurement year $ 594,217 $ 653,013