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Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments From time to time, the Company seeks to offset its exposure to interest rate and market changes and certain of its Affiliates seek to offset their exposure to changes in foreign exchange rates by entering into derivative contracts. For the years ended December 31, 2016 and 2017, the Company’s Affiliates realized $0.2 million and $1.6 million of gains, respectively, and $1.2 million and $2.2 million of losses, respectively, upon the settlement of certain foreign currency forward contracts. Such realized gains and losses are presented in Revenue, Operating expenses or Investment and other income, depending on the risk being hedged. At December 31, 2016 and 2017, the Company’s Affiliates had unrealized gains of $0.6 million and $0.2 million, respectively, and unrealized losses of $0.5 million and $0.6 million, respectively, related to outstanding foreign currency forward contracts.  Such unrealized gains and losses are presented within Accumulated other comprehensive loss. During the fourth quarter of 2017, the Company recognized an expense of $2.5 million under a market based derivative contract. This contract expired on December 29, 2017.

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- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-URI http://asc.fasb.org/topic&trid=2229140

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