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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 1,825,791 $ 1,796,304
Other comprehensive income (loss) 651 (24,137)
Ending balance 1,760,514 1,842,695
Total accumulated comprehensive loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (28,512) (7,769)
Ending balance (27,861) (31,906)
Pension and post-retirement benefit plan adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (9,218) (12,799)
Other comprehensive income (loss) 0 0
Ending balance (9,218) (12,799)
Share of affiliates' comprehensive income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (19,294) 5,030
Other comprehensive income (loss) 651 (24,137)
Ending balance $ (18,643) $ (19,107)