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Fair Value Measurements - Assets and liabilities at fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Liabilities    
Fair value asset, Transfer between Level 1 to Level 2 $ 0 $ 0
Fair value asset, Transfer between Level 2 to Level 1 0 0
Fair value Liabilities, Transfer between Level 1 to Level 2 0 0
Fair value Liabilities, Transfer between Level 2 to Level 1 0 0
Level 1    
Assets    
Total assets 14,286 14,088
Liabilities    
Total liabilities 1,884 1,846
Level 2    
Assets    
Total assets 5,262 16,643
Liabilities    
Total liabilities 4,471 1,138
Other current assets | Rabbi trust | Level 1    
Assets    
Total assets 6,994 6,994
Other current assets | Foreign exchange derivative instruments | Level 2    
Assets    
Total assets 3,582 11,357
Other noncurrent assets | Rabbi trust | Level 1    
Assets    
Total assets 5,408 5,248
Other noncurrent assets | Foreign exchange derivative instruments | Level 2    
Assets    
Total assets 1,680 5,286
Other noncurrent assets | Deferred compensation program assets | Level 1    
Assets    
Total assets 1,884 1,846
Other current liabilities | Foreign exchange derivative instruments | Level 2    
Liabilities    
Total liabilities 3,784 1,106
Other noncurrent liabilities | Foreign exchange derivative instruments | Level 2    
Liabilities    
Total liabilities 687 32
Other noncurrent liabilities | Deferred compensation program liabilities | Level 1    
Liabilities    
Total liabilities $ 1,884 $ 1,846