Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	May 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Inventory, net
Raw materials		$ 89,127	$ 84,431
Work-in-progress		15,630	1,204
Finished goods		14,293	17,960
Total inventory		119,050	103,595
Cash contribution for joint venture	$ 20,000
Accounting Standards Update 2016-09
Inventory, net
Decrease in deferred tax liabilities		7,100
Decrease in capital in excess		1,900
Accounting Standards Update 2016-09 | Reclassification
Inventory, net
Increase in retained earnings		7,100
Accrued liabilities
Inventory, net
Deferred Revenue		241,800	255,600
Other long-term liabilities
Inventory, net
Deferred Revenue		167,800	321,000
Other current assets
Inventory, net
Deferred expenses		66,600	63,400
Other long term assets
Inventory, net
Deferred expenses		$ 41,700	$ 69,500
Saudi Aramco
Inventory, net
Cash contribution for joint venture	20,000
Joint Venture in Saudi Arabia
Inventory, net
Cash contribution for joint venture	$ 40,000