Revenue from Contracts with Customers - Contract Assets Table (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Change in Contracts with Customer, Asset [Roll Forward]
Balance at December 31, 2018		$ 47,621
Amounts transferred to Accounts receivable, net that were included in the contract assets balance at the beginning of the period (1)	$ (3,000)	(4,547)
Additional estimated revenues recognized (2)	(3,600)	6,373
Balance at September 30, 2019	49,447	49,447
Contract assets at September 30, 2019
Other current assets			$ 5,130	$ 5,399
Other assets			44,317
Total contract assets from contracts with customers	$ 49,447	$ 47,621	$ 49,447	$ 47,621