Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets Narrative (Details)

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Goodwill and Intangible Assets Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill recognized and expected to be deductible for income tax purposes   $ 0    
Write-off of intangibles $ 600,000      
Amortization expense   $ 2,800,000 $ 3,500,000 $ 4,300,000