Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of accumulated other comprehensive income (loss)      
Balance $ 568,545 $ 524,029 $ 462,676
Change during the period      
Other comprehensive earnings/(loss) 24,119 1,103 (5,690)
Balance 653,924 568,545 524,029
Pension Liability Adjustment      
Components of accumulated other comprehensive income (loss)      
Balance (49,200) (50,905)  
Change during the period      
Before-tax amount 18,980 3,045  
Tax benefit (4,821) (1,340)  
Other comprehensive earnings/(loss) 14,159 1,705  
Balance (35,041) (49,200) (50,905)
Foreign Currency Translation      
Components of accumulated other comprehensive income (loss)      
Balance (20,875) (20,273)  
Change during the period      
Before-tax amount 9,960 (602)  
Tax benefit 0 0  
Other comprehensive earnings/(loss) 9,960 (602)  
Balance (10,915) (20,875) (20,273)
Total      
Components of accumulated other comprehensive income (loss)      
Balance (70,075) (71,178) (65,488)
Change during the period      
Before-tax amount 28,940 2,443  
Tax benefit (4,821) (1,340)  
Other comprehensive earnings/(loss) 24,119 1,103  
Balance $ (45,956) $ (70,075) $ (71,178)