Revenue (Contract Assets and Advance Billings) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contracts assets, current	$ 17,319	$ 16,115
Contracts assets, noncurrent	11,385	13,092
Advance billings, current	203,735	221,527
Advance billings, noncurrent	13,144	$ 12,778
Increase (decrease)
Contracts assets, current	1,204
Contracts assets, noncurrent	(1,707)
Advance billings, current	(17,792)
Advance billings, noncurrent	$ 366

Contract with Customer, Asset, Increase (Decrease), Current

No definition available.

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- Definition

Contract with Customer, Asset, Increase (Decrease), Noncurrent

+ References

No definition available.

+ Details

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- Definition

Contract with Customer, Liability, Increase (Decrease), Current

+ References

No definition available.

+ Details

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- Definition

Contract with Customer, Liability, Increase (Decrease), Noncurrent

+ References

No definition available.

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- References

No definition available.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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- Definition

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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