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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 1,909,826 $ 1,916,179
Other comprehensive income 1,621 2,606
Ending balance 1,784,429 1,723,971
Pension and post-retirement benefit plan adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (12,956) (12,400)
Other comprehensive income 0 0
Ending balance (12,956) (12,400)
Share of affiliates' comprehensive income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 3,414 (192)
Other comprehensive income 1,621 2,606
Ending balance 5,035 2,414
Total accumulated comprehensive (loss) income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (9,542) (12,592)
Other comprehensive income 1,621 2,606
Ending balance $ (7,921) $ (9,986)