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Goodwill and Intangible Assets - Impairments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Impairments      
Asset impairment $ 69,520 $ 126 $ 58,170
ALD      
Impairments      
Impairment of goodwill     28,000
Asset impairment $ 54,300    
Customer relationships | ALD      
Impairments      
Asset impairment     17,400
In-process research and development | ALD      
Impairments      
Asset impairment     4,800
Other long-lived assets | ALD      
Impairments      
Asset impairment     25,900
Certain tangible assets | ALD      
Impairments      
Asset impairment     $ 3,600