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Deferred Costs	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred Costs	Deferred CostsDeferred costs, which primarily consist of costs to obtain contracts with customers, were $9.3 million as of March 31, 2018. Amortization expense for the deferred costs was $2.0 million for the three months ended March 31, 2018. There was no significant impairment loss in relation to the costs capitalized for the periods presented.

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Capitalized Contract Cost

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