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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 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 (27,868) 1,621
Ending balance 2,146,396 1,784,429
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 (loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 5,030 3,414
Other comprehensive income (27,868) 1,621
Ending balance (22,838) 5,035
Accumulated Other Comprehensive (Loss) Income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (7,769) (9,542)
Other comprehensive income (27,868) 1,621
Ending balance $ (35,637) $ (7,921)