Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Narrative (Details)

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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill [Line Items]          
Goodwill impairment $ 0   $ 0 $ 131,997 $ 0
Amortization expense of intangible assets $ 1,900   $ 5,100 $ 11,200 $ 15,400
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Goodwill [Line Items]          
Asset Impairment Charges   $ 131,700      
Fair value of net assets   184,500      
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Goodwill [Line Items]          
Goodwill impairment   $ 300