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Taxes - Changes in the Reserve for Income Taxes, Excluding Interest and Penalties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Balance of reserve for income taxes $ 5,719 $ 5,296
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in prior periods   11
Unrecognized Tax Benefits, Period Increase (Decrease) (56)  
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period 1,993 1,235
Gross amounts of decreases in unrecognized tax benefits relating to settlements with taxing authorities (116) 0
Gross amounts of decreases in unrecognized tax benefits as a result of the expiration of the applicable statutes of limitations (791) (823)
Balance of reserve for income taxes $ 6,749 $ 5,719