Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of total amounts of unrecognized tax benefits (Details 4)

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Income Taxes - Reconciliation of total amounts of unrecognized tax benefits (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits, beginning of the year $ 11,144 $ 11,174
Gross increases in tax positions from prior periods 300 250
Gross decreases in tax positions from prior periods   (280)
Settlement of tax positions (250)  
Lapse of statute of limitations (10,662)  
Unrecognized tax benefits, end of year $ 532 $ 11,144