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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 50,201,000 $ 60,801,000 $ 64,743,000
Other comprehensive income (loss), before tax:      
Change in foreign currency translation adjustments (174,000) (19,159,000) 37,454,000
Unrealized gain (loss) on derivatives      
Unrealized derivative (loss) gain arising during period (13,671,000) 11,709,000 (3,425,000)
Less: Reclassification adjustments for gains included in net income 14,865,000 13,400,000 2,958,000
Unrealized loss on derivatives (28,536,000) (1,691,000) (6,383,000)
Defined benefit pension plan - net (loss) arising during period (8,973,000) (643,000) (57,000)
Total other comprehensive income (loss), before tax (37,683,000) (21,493,000) 31,014,000
Income tax benefit (expense) related to items in other comprehensive loss 6,724,000 (143,000) 2,333,000
Total other comprehensive income (loss), net of tax (30,959,000) (21,636,000) 33,347,000
Comprehensive income, net of tax $ 19,242,000 $ 39,165,000 $ 98,090,000