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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Restated) - Schedules of Accumulate Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net (loss) gain on qualifying cash flow hedging instruments, including share of affiliate $ (192) $ 8,672 $ 2,003
Losses associated with pensions, net of tax recoveries of $nil (2014: $0.2 million) (12,400) (15,251) (12,731)
Losses associated with pensions, tax recoveries 0 200  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of the period 2,237,422 1,771,727 1,755,947
Other comprehensive (loss) income before reclassification (1,971) 914 14,085
Amount reclassified from accumulated other comprehensive income 382 3,235 8
Net current-period other comprehensive income (1,589) 4,149 14,093
Transfer of additional paid in capital 1,579    
Balance at end of the period 1,916,179 2,237,422 1,771,727
Pension and post retirement benefit plan adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of the period (15,251) (12,731) (17,809)
Other comprehensive (loss) income before reclassification 2,851 (2,520) 5,078
Amount reclassified from accumulated other comprehensive income 0 0 0
Net current-period other comprehensive income 2,851 (2,520) 5,078
Transfer of additional paid in capital 0    
Balance at end of the period (12,400) (15,251) (12,731)
Gains (losses) on cash flow hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of the period 4,042 (2,676) (6,832)
Other comprehensive (loss) income before reclassification 0 3,483 4,148
Amount reclassified from accumulated other comprehensive income 382 3,235 8
Net current-period other comprehensive income 382 6,718 4,156
Transfer of additional paid in capital (4,424)    
Balance at end of the period 0 4,042 (2,676)
Share of affiliates comprehensive income      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of the period 4,630 4,679 (180)
Other comprehensive (loss) income before reclassification (4,822) (49) 4,859
Amount reclassified from accumulated other comprehensive income 0 0 0
Net current-period other comprehensive income (4,822) (49) 4,859
Transfer of additional paid in capital 0    
Balance at end of the period (192) 4,630 4,679
Total accumulated comprehensive (loss) income      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of the period (6,579) (10,728) (24,821)
Transfer of additional paid in capital (4,424)    
Balance at end of the period $ (12,592) $ (6,579) $ (10,728)