Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes - Unrecognized Tax Benefits (Details)

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Income Taxes Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits at beginning of the year $ 647 $ 1,525 $ 1,525
Reversal of prior year unrecognized tax benefits due to the expiration of the statute of limitations (647) (878) 0
Unrecognized tax benefits at end of the year $ 0 $ 647 $ 1,525