Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Contract Balances) (Details)

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Revenue Recognition (Contract Balances) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Changes in contract liabilities    
Balance at Beginning of Period $ 3,316 $ 2,048
Additions 2,434 8,605
Deductions (3,544) (8,447)
Balance at End of Period 2,206 2,206
Contract assets 0 0
Revenue recognized included in contract liabilities at the beginning of the period $ 980 $ 2,365