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Other Long-Term Assets	12 Months Ended
Other Long-Term Assets	Dec. 31, 2017
Text Block [Abstract]
Other Long-Term Assets	Other Long-Term Assets As of December 31, 2017, other long-term assets included $1.0 million related to deferred debt-issuance costs related to the revolving credit facility, $1.6 million related to the long-term portion of certain software and maintenance contracts, $0.7 million relating to the long-term portion of certain lease receivables, deferred tax asset of $1.0 million and a derivative asset of $0.2 million. As of December 31, 2016, other long-term assets included $1.9 million related to deferred debt-issuance costs related to the revolving credit facility, $2.3 million related to the long-term portion of certain software and maintenance contracts, deferred tax asset of $0.8 million and $1.1 million relating to the long-term portion of certain lease receivables.