Revenue - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Unbilled receivables (contract assets)	$ 20,657	$ 20,657	$ 11,844
Unbilled receivables (contract assets), $ Change		$ 8,813
Unbilled receivables (contract assets), % Change		74.00%
Contract liabilities	(59,833)	$ (59,833)	(57,522)
Contract liabilities, $ Change		$ (2,311)
Contract liabilities, % Change		4.00%
Net contract liabilities	(39,176)	$ (39,176)	(45,678)
Net contract liabilities, $ Change		$ 6,502
Net contract liabilities, % Change		(14.00%)
Customer advances	$ 18,179	$ 18,179	$ 15,348
Revenue recognized	20.00%	55.00%

Contract with Customer, Asset (Liability), Percent Change

No definition available.

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- Definition

Contract with Customer, Asset, Percent Change

+ References

No definition available.

+ Details

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- Definition

Contract with Customer, Liability, Percent Change

+ References

No definition available.

+ Details

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- Definition

Contract with Customer, Liability, Revenue Recognized, Percent

+ References

No definition available.

+ Details

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- Definition

Contract with Customer, Net Asset (Liability)

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Contract with Customer, Net Asset (Liability), Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
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+ Details

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- Definition

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, classified as current.

+ References

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-Publisher FASB
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

+ References

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-Publisher FASB
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- Definition

The current portion of prepayments received from customers for goods or services to be provided in the future.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- References

No definition available.

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