Revenue Recognition (Adoption of ASC 606) - Schedule of Contract Asset and Liability (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Change in Contract with Customer, Asset [Roll Forward]
Contract Assets at December 31, 2017	$ 41,825
Additions	48,676
Transfer to Accounts Receivable	(34,169)
Contract Assets at March 31, 2018	56,332
Change in Contract with Customer, Liability [Abstract]
Contract Liabilities at December 31, 2017	4,767
Additions	4,969
Revenue Recognized	(3,986)
Contract Liabilities at March 31, 2018	$ 5,750

Change in Contract with Customer, Asset [Roll Forward]

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Contract with Customer, Liability, Increase from Cash Receipts

+ References

No definition available.

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- References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045

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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.

+ References

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- Definition

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.

+ References

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- Definition

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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