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Revenue Recognition (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 02, 2018	Dec. 31, 2017
Contract with Customer, Liability, Revenue Recognized	$ 20,500	$ 31,100
Revenue, Remaining Performance Obligation	930,615	930,615
Retained Earnings (Accumulated Deficit)	156,150	156,150		$ 143,241
Accounting Standards Update 2014-09 [Member]
Increase in Revenue	$ 200	$ 300
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
Retained Earnings (Accumulated Deficit)			$ 700

X

- Definition

The increase amount of revenue during the year.

+ References

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

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-Publisher FASB
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-Topic 606
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