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Fair Value Measurements - Assets and liabilities at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Level 1    
Assets    
Total assets $ 6,940 $ 9,637
Liabilities    
Liabilities 870 1,222
Level 1 | Other current assets    
Assets    
Rabbi trust 6,070 8,415
Level 1 | Other noncurrent assets    
Assets    
Deferred compensation program assets 870 1,222
Level 1 | Other noncurrent liabilities    
Liabilities    
Deferred compensation program liabilities 870 1,222
Level 2    
Assets    
Total assets 5,658 7,131
Liabilities    
Liabilities 5,327 2,190
Level 2 | Other current assets    
Assets    
Rabbi trust 0 0
Level 2 | Other noncurrent assets    
Assets    
Deferred compensation program assets 0 0
Level 2 | Other noncurrent liabilities    
Liabilities    
Deferred compensation program liabilities 0 0
Level 3    
Assets    
Total assets 0 0
Liabilities    
Liabilities 0 0
Level 3 | Other current assets    
Assets    
Rabbi trust 0 0
Level 3 | Other noncurrent assets    
Assets    
Deferred compensation program assets 0 0
Level 3 | Other noncurrent liabilities    
Liabilities    
Deferred compensation program liabilities 0 0
Foreign exchange derivative instruments | Level 1 | Other current assets    
Assets    
Derivative asset 0 0
Foreign exchange derivative instruments | Level 1 | Other noncurrent assets    
Assets    
Derivative asset 0 0
Foreign exchange derivative instruments | Level 1 | Accrued expenses and other liabilities    
Liabilities    
Derivative liability 0 0
Foreign exchange derivative instruments | Level 1 | Other noncurrent liabilities    
Liabilities    
Derivative liability 0 0
Foreign exchange derivative instruments | Level 2 | Other current assets    
Assets    
Derivative asset 4,549 6,116
Foreign exchange derivative instruments | Level 2 | Other noncurrent assets    
Assets    
Derivative asset 1,109 1,015
Foreign exchange derivative instruments | Level 2 | Accrued expenses and other liabilities    
Liabilities    
Derivative liability 2,561 578
Foreign exchange derivative instruments | Level 2 | Other noncurrent liabilities    
Liabilities    
Derivative liability 115 161
Foreign exchange derivative instruments | Level 3 | Other current assets    
Assets    
Derivative asset 0 0
Foreign exchange derivative instruments | Level 3 | Other noncurrent assets    
Assets    
Derivative asset 0 0
Foreign exchange derivative instruments | Level 3 | Accrued expenses and other liabilities    
Liabilities    
Derivative liability 0 0
Foreign exchange derivative instruments | Level 3 | Other noncurrent liabilities    
Liabilities    
Derivative liability 0 0
Interest rate swap derivative instrument | Level 1 | Accrued expenses and other liabilities    
Liabilities    
Derivative liability 0 0
Interest rate swap derivative instrument | Level 1 | Other noncurrent liabilities    
Liabilities    
Derivative liability 0 0
Interest rate swap derivative instrument | Level 2 | Accrued expenses and other liabilities    
Liabilities    
Derivative liability 1,862 526
Interest rate swap derivative instrument | Level 2 | Other noncurrent liabilities    
Liabilities    
Derivative liability 789 925
Interest rate swap derivative instrument | Level 3 | Accrued expenses and other liabilities    
Liabilities    
Derivative liability 0 0
Interest rate swap derivative instrument | Level 3 | Other noncurrent liabilities    
Liabilities    
Derivative liability $ 0 $ 0