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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 1,796,304 $ 1,909,826
Other comprehensive income (24,137) 1,632
Ending balance 1,842,695 1,822,646
Pension and post-retirement benefit plan adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (12,799) (12,956)
Other comprehensive income 0 0
Ending balance (12,799) (12,956)
Share of affiliates' comprehensive income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 5,030 3,414
Other comprehensive income (24,137) 1,632
Ending balance (19,107) 5,046
Total accumulated comprehensive loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (7,769) (9,542)
Other comprehensive income (24,137) 1,632
Ending balance $ (31,906) $ (7,910)