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
Jun. 30, 2018
Jan. 02, 2018
Revenue Recognition [Abstract]    
Trade receivables $ 72,693 $ 62,199
Contract assets 2,206 11,226
Contract liabilities $ 21,754 $ 30,304