Revenue Contract Balances (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Jan. 01, 2018
Contract with Customer, Asset and Liability [Abstract]
Contract assets balance	$ 16,202	$ 11,932
Contract liability balance	52,692	58,184
Contract liabilities - current	43,075	48,268
Contract liabilities - non-current	9,617	$ 9,916
Change in Contract with Customer, Asset and Liability [Abstract]
Cumulative catch-up adjustment upon transition, asset	701
Changes in the estimate of the stage of completion	10,870
Transferred to receivables from contract assets recognized during the period	(7,255)
Contract with Customer, Asset, Other	(46)
Cumulative catch-up adjustment upon transition, liability	0
Revenue recognized that was included in the contract liability balance at the beginning of the period	(52,730)
Increases due to cash received, excluding amounts recognized as revenue during the period	47,880
Contract with Customer, Liability, Other	$ (642)

Contract with Customer, Liability, Estimate of the Stage of Completion

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Contract with Customer, Liability, Increase (Decrease) for Contract [Line Items]

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Contract with Customer, Liability, Other

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Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, from business combination.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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