Revenue from Contracts with Customers (Contract Assets and Advance Billings) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contracts assets, current	$ 8,213	$ 5,075
Contracts assets, noncurrent	4,006	648
Advance billings	186,778	209,098
Advance billings, noncurrent	14,658	$ 17,765
Total increase (decrease)
Contracts assets, current	3,138
Contracts assets, noncurrent	3,358
Advance billings, current	(22,320)
Advance billings, noncurrent	$ (3,107)

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.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- References

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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.

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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

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-Publisher FASB
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