Quarterly report pursuant to Section 13 or 15(d)

Revenue Contract Assets and Liabilities (Details)

v3.19.1
Revenue Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Performance Obligation Satisfied in Previous Period $ 0 $ 0  
Contract assets 1,661   $ 485
Contract with customer, liability 11,000   $ 11,300
Contract with customer, liability, revenue recognized $ 3,700