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Subsequent Events (Notes)	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 22, 2015, we acquired substantially all of the assets of Hypack, Inc., a leading provider of hydrographic software worldwide, for approximately $18 million.  Hypack, a privately-owned company headquartered in Middletown, Connecticut, has approximately 30 employees and annual revenue of approximately $8 million.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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