Revenue Recognition - Schedule of Significant Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Contractors [Abstract]
Contract assets	$ 0	$ 987
Change in Contract Asset	$ (987)
Percent Change in Contract Asset	(100.00%)
Contract liabilities	$ (10,028)	(10,000)
Change in Contract Liability	$ (10,028)
Percent Change in Contract Liability	0.00%
Net contract assets (liabilities)	$ (10,028)	$ 987
Change in Net Contract Assets (Liabilities)	$ (11,015)
Percent Change in Net Contract Assets (Liabilities)	(1116.00%)