Contract Assets, Contract Costs and Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Current	$ 121,614	$ 99,261
Increase (Decrease) in Contract with Customer, Asset Current	$ 22,353
Increase (Decrease) in Contract with Customer Asset, Current, Percentage	22.50%
Capitalized Contract Cost, Net, Current	$ 6,052	5,993
increase (Decrease) in Capitalized Contract Cost Current	$ 59
Increase (Decrease) in Capitalized Contract Cost, Current, Percentage	1.00%
Capitalized Contract Cost, Net, Noncurrent	$ 6,099	10,666
Increase (Decrease) in Capitalized Contract Cost Noncurrent	$ (4,567)
Increase (Decrease) in Capitalized Contract Cost, Noncurrent, Percentage	(42.80%)
Contract with Customer, Liability, Current	$ 42,942	28,865
Increase (Decrease) in Contract with Customer Liability, Current	$ 14,077
Increase (Decrease) in Contract with Customer Liability, Current, Percentage	48.80%
Contract with Customer, Liability, Noncurrent	$ 37,855	78,562
Increase (Decrease) in Contract with Customer Liability, Noncurrent	$ (40,707)
Increase (Decrease) in Contract with Customer Liability, Noncurrent, Percentage	(51.80%)
Customer Advances and Progress Payments for Long-term Contracts or Programs	$ 30,200		$ 30,300
Capitalized Contract Cost, Amortization	11,600	3,700
Contract with Customer, Liability, Revenue Recognized	48,500	12,100
Contract Changes Negotiated Settlements and Claims [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Current	3,745	2,909
Costs to Fulfill [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net	6,600	8,900
Costs to Obtain [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net	$ 5,600	$ 7,800