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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details 2) (USD $)
In Thousands, unless otherwise specified
 4 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Before-Tax Amount    
Foreign currency translation adjustment   $ 179
Pension and other benefit adjustments:    
Net gain (loss) arising during the period   13,808
Prior service credit arising during the period   15,197
Amortization of net (gains) loss   (78)
Unrealized gain (loss) on marketable securities:    
Unrealized holding gain (loss) arising during the period   (2,703)
Less: reclassification adjustment for (gains) loss   925
Unrealized gain from equity method investees' cash flow hedge    
Unrealized holding gains arising during the period   3,474
Less: reclassification of holding gains   (510)
Other comprehensive income   30,292
Pension and other benefit adjustments:    
Net gain (loss) arising during the period   (9,298)
Prior service credit arising during the period   (5,926)
Unrealized gain (loss) on marketable securities:    
Unrealized holding gain (loss) arising during the period   1,081
Unrealized gain from equity method investees' cash flow hedge    
Unrealized holding gains arising during the period   (1,389)
Other comprehensive income   (15,532)
Net-of-Tax Amount    
Foreign currency translation adjustment, net of tax (530) 179
Pension and other benefit adjustments:    
Net gain (loss) arising during the period, net of tax 7,279 4,510
Prior service credit arising during the period   9,271
Amortization of net (gains) loss   (78)
Unrealized gain (loss) on marketable securities:    
Unrealized holding gain (loss) arising during the period, net of tax 1,915 (1,622)
Less: reclassification adjustment for loss included in investment expense, net of tax (2) 925
Unrealized gain from equity method investees' cash flow hedge, net of tax:    
Unrealized holding gains arising during the period 797 2,085
Less: reclassification of holding gains   (510)
Other comprehensive income (loss) $ 9,444 $ 14,760