Quarterly report pursuant to Section 13 or 15(d)

Revenue Contract Assets and Liabilities (Details)

v3.19.3
Revenue Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]          
Contract assets $ 1,330   $ 1,330   $ 485
Contract with customer, liability 10,800   10,800   $ 11,300
Contract with customer, liability, revenue recognized 3,400 $ 3,800 8,300 $ 7,300  
Contract with customer, performance obligation satisfied in previous period $ 0   $ 0