Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Change by Component (Details)

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Accumulated Other Comprehensive Income - Change by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax      
Beginning balance $ 1,664,145 $ 1,631,919  
Amounts reclassified from accumulated other comprehensive income (82) (9)  
Total other comprehensive income 5,585 10,836  
Ending balance $ 1,675,272 1,647,084  
Document Period End Date Mar. 31, 2019    
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax      
Beginning balance $ (39,104) 4,311  
Other comprehensive income (loss) before reclassifications 5,352 9,541  
Amounts reclassified from accumulated other comprehensive income (82) (9)  
Cumulative effect adjustment from adoption of new accounting standards     $ 1,874
Total other comprehensive income 5,270 9,532  
Ending balance (31,960) 13,843  
Defined benefit and other postretirement plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax      
Beginning balance (546) 7,412  
Other comprehensive income (loss) before reclassifications 1 (4)  
Amounts reclassified from accumulated other comprehensive income (31) (14)  
Cumulative effect adjustment from adoption of new accounting standards     1,684
Total other comprehensive income (30) (18)  
Ending balance 1,108 7,394  
Net gain (loss) from hedging activities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax      
Beginning balance 637 967  
Other comprehensive income (loss) before reclassifications (1,501) 2,178  
Amounts reclassified from accumulated other comprehensive income (51) 5  
Cumulative effect adjustment from adoption of new accounting standards     190
Total other comprehensive income (1,552) 2,183  
Ending balance (725) 3,150  
Foreign currency translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax      
Beginning balance (39,195) (4,068)  
Other comprehensive income (loss) before reclassifications 6,852 7,367  
Amounts reclassified from accumulated other comprehensive income 0 0  
Cumulative effect adjustment from adoption of new accounting standards     $ 0
Total other comprehensive income 6,852 7,367  
Ending balance $ (32,343) $ 3,299