Equity Method Investments

Equity investments in affiliates comprise the following as of the dates indicated:



	September 30, 2017			December 31, 2016
	Ownership	Investment Amount		Ownership	Investment Amount
Bengal	50.0%	$	78.2	50.0%	$	76.1
Odyssey	49.0%	3.6		49.0%	3.0
Mars	48.6%	129.7		48.6%	130.2
Poseidon	36.0%	4.8		36.0%	13.2
Proteus	10.0%	17.6		10.0%	19.1
Endymion	10.0%	19.9		10.0%	20.8
		$	253.8		$	262.4

Unamortized differences in the basis of the initial investments and our interest in the separate net assets within the financial statements of the investees are amortized into net income over the remaining useful lives of the underlying assets. As of September 30, 2017 and December 31, 2016, the unamortized basis differences included in our equity investments are $28.4 million and $30.9 million, respectively. For the three and nine months ended September 30, 2017, the net amortization expense was $0.7 million and $2.1 million, respectively. For the three and nine months ended September 30, 2016, the net amortization expense was $0.3 million and $1.1 million, respectively.

Our equity investments in affiliates balance was affected by the following during the periods indicated:



	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
	Distributions Received		Income from Equity Investments		Purchase Price Adjustment		Distributions received		Income from Equity investments		Purchase Price Adjustment
Bengal	$	5.5	$	6.2	$	—	$	14.8	$	16.9	$	—
Odyssey	4.4		5.0		—		13.1		13.7		—
Mars	21.9		22.0		—		64.2		63.7		—
Poseidon	9.6		7.3		—		28.9		20.5		—
Proteus	0.6		0.3		—		2.3		1.1		0.3
Endymion	0.5		0.4		—		2.0		1.2		0.1
	$	42.5	$	41.2	—		$	125.3	$	117.1	$	0.4



	Three Months Ended September 30, 2016				Nine Months Ended September 30, 2016
	Distributions Received		Income from Equity Investments		Distributions Received		Income from Equity Investments
Bengal	$	2.7	$	5.2	$	16.1	$	15.9
Mars	11.5		8.6		34.5		31.7
Poseidon	10.5		7.6		31.9		22.6
	$	24.7	$	21.4	$	82.5	$	70.2

The following tables present aggregated selected unaudited income statement data for our equity method investments (on a 100% basis):



	Three Months Ended September 30, 2017
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	18.7	$	6.8	$	11.9	$	11.9
Odyssey	11.1		1.0		10.1		10.1
Mars	66.0		19.5		46.5		46.5
Poseidon	30.6		8.2		22.4		20.7
Proteus	7.6		2.9		4.7		4.4
Endymion	8.2		3.3		4.9		4.9



	Nine Months Ended September 30, 2017
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	54.6	$	21.1	$	33.5	$	33.4
Odyssey	30.8		3.0		27.8		27.8
Mars	197.3		63.7		133.6		133.6
Poseidon	88.0		24.8		63.2		58.7
Proteus	22.8		9.0		13.8		12.9
Endymion	25.3		9.6		15.7		14.9



	Three Months Ended September 30, 2016
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	17.3	$	7.2	$	10.1	$	10.3
Mars	54.0		23.1		30.9		30.9
Poseidon	31.3		8.2		23.1		22.0



	Nine Months Ended September 30, 2016
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	52.3	$	20.7	$	31.6	$	31.7
Mars	175.5		62.1		113.4		113.4
Poseidon	90.7		22.5		68.2		64.7

The difference between operating income and net income represents interest expense or interest income.