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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On January 3, 2018, pursuant to the Unit Purchase Agreement dated December 15, 2017, the Company completed the sale of its entire interest in Parkmobile, LLC ("Parkmobile") to Parkmobile USA, Inc. ("Parkmobile USA"). Prior to the sale of its 30% interest in Parkmobile, the Company accounted for such interest as an equity method investment, see Note 1. Significant Accounting Policies and Practices for further discussion of the Parkmobile investment under Equity Investment in Unconsolidated Entities. Pursuant to the sale of Parkmobile, the Company received proceeds of $19.0 million and in the first quarter of 2018, the Company expects to record a pre-tax gain of approximately $10.1 million