Equity Method Investments

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



	June 30, 2017			December 31, 2016
	Ownership	Investment Amount		Ownership	Investment Amount
Bengal	50.0%	$	77.7	50.0%	$	76.1
Odyssey	49.0%	3.0		49.0%	3.0
Mars	48.6%	129.4		48.6%	130.2
Poseidon	36.0%	7.1		36.0%	13.2
Proteus	10.0%	17.9		10.0%	19.1
Endymion	10.0%	20.0		10.0%	20.8
		$	255.1		$	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 June 30, 2017 and December 31, 2016, the unamortized basis differences included in our equity investments are $29.1 million and $30.9 million, respectively. For the three and six months ended June 30, 2017, the net amortization expense was $0.7 million and $1.4 million, respectively. For the three and six months ended June 30, 2016, the net amortization expense was $0.3 million and $0.8 million, respectively.

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



	Three Months Ended June 30, 2017						For the Six Months Ended June 30, 2017
	Distributions Received		Income from Equity Investments		Purchase Price Adjustment		Distributions received		Income from Equity investments		Purchase Price Adjustment
Bengal	$	4.6	$	5.4	$	—	$	9.3	$	10.7	$	—
Odyssey	4.5		4.4		—		8.7		8.7		—
Mars	19.0		20.2		—		42.3		41.7		—
Poseidon	9.2		6.4		—		19.3		13.2		—
Proteus	0.8		0.4		—		1.7		0.8		0.3
Endymion	0.8		0.4		—		1.5		0.8		0.1
	$	38.9	$	37.2	—		$	82.8	$	75.9	$	0.4



	Three Months Ended June 30, 2016				Six Months Ended June 30, 2016
	Distributions Received		Income from Equity Investments		Distributions Received		Income from Equity Investments
Bengal	$	7.1	$	5.3	$	13.4	$	10.7
Mars	13.1		12.2		23.0		23.1
Poseidon	11.3		8.1		21.4		15.0
	$	31.5	$	25.6	$	57.8	$	48.8

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



	Three Months Ended June 30, 2017
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	18.1	$	7.1	$	11.0	$	10.9
Odyssey	9.9		1.0		8.9		8.9
Mars	66.4		24.3		42.1		42.1
Poseidon	28.5		8.5		20.0		18.6
Proteus	7.3		3.0		4.3		4.0
Endymion	8.5		3.2		5.3		4.8



	Six Months Ended June 30, 2017
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	35.9	$	14.3	$	21.6	$	21.5
Odyssey	19.7		2.0		17.7		17.7
Mars	131.3		44.2		87.1		87.1
Poseidon	57.4		16.6		40.8		38.0
Proteus	15.2		6.1		9.1		8.5
Endymion	17.1		6.3		10.8		10.0



	Three Months Ended June 30, 2016
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	17.6	$	7.1	$	10.5	$	10.4
Mars	64.2		20.5		43.7		43.7
Poseidon	32.0		7.7		24.3		23.0



	Six Months Ended June 30, 2016
	Total Revenues		Total Operating Expenses		Operating Income		Net Income
Statements of Income
Bengal	$	35.0	$	13.5	$	21.5	$	21.4
Mars	121.5		39.0		82.5		82.5
Poseidon	59.4		14.3		45.1		42.7

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