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
Mar. 31, 2018
USD ($)
Changes in contract liabilities  
Balance at Beginning of Period $ 2,048
Additions 1,819
Deductions (1,648)
Balance at End of Period 2,219
Contract assets 0
Revenue recognized included in contract liabilities at the beginning of the period $ 279