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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018
Contracts with Customers, Asset and Liability [Line Items]
Advance billings on contracts	$ 77,775	$ 73,390
Contracts in Progress
Contracts with Customers, Asset and Liability [Line Items]
Contract with customer, asset	306,535	250,325
Accounts Receivable
Contracts with Customers, Asset and Liability [Line Items]
Contract with customer, asset	96,731	82,801
Other Assets
Contracts with Customers, Asset and Liability [Line Items]
Contract with customer, asset	$ 1,626	$ 1,669

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- Definition

Contracts with Customers, Asset and Liability [Line Items]

+ References

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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, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 606
-SubTopic 10
-Section 45
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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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