Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Schedule of Contract with Customer, Assets and Liabilities (Details)

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Revenue Recognition - Schedule of Contract with Customer, Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 02, 2018
Revenue Recognition [Abstract]    
Trade receivables $ 75,812 $ 62,199
Contract assets 4,362 11,226
Contract liabilities $ 27,984 $ 30,304