Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v3.8.0.1
Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Income tax provision (benefit)   $ (2,816) $ (3,160)  
Business acquisition, uncertain tax positions   11,700   $ 11,000
Unrecognized tax benefits, income tax penalties and interest accrued   $ 6,300   $ 5,900
Forecast | Minimum        
Income Tax Contingency [Line Items]        
Income tax benefit expected due to change in tax law $ 5,000      
Forecast | Maximum        
Income Tax Contingency [Line Items]        
Income tax benefit expected due to change in tax law $ 8,000