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Derivative Financial Instruments
 12 Months Ended
Dec. 31, 2016
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 changing interest rates under its debt financing arrangements and certain of its Affiliates seek to offset their exposure to changing foreign exchange rates by entering into derivative contracts.
For the years ended December 31, 2015 and 2016, the Company’s Affiliates realized $3.2 million and $0.2 million of gains, respectively, and $1.7 million and $1.2 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, the Company’s Affiliates had unrealized gains and losses related to outstanding foreign currency forward contracts of $0.6 million and $0.5 million, respectively.  Such unrealized gains and losses are presented within Accumulated other comprehensive income. There were no foreign currency forward contracts outstanding at December 31, 2015.