Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.8.0.1
Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]          
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 20,700        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 1,000   $ 954 $ 0 $ 0
Foreign Earnings Repatriated   $ 19,800      
Net operating loss carryforwards 0   0    
Foreign net operating loss carryforwards $ 1,250   $ 1,250