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Note 10 - Related Party Transactions and Parent Company Equity - Components of Net Transfers to Parent (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Net change in current income tax accounts	$ (39,083)	$ 85,071
Allocation of overhead and other expenses-from Parent	5,800	12,671
Net advances to Parent	488	(227,022)
Total net transfers to Parent	$ (32,795)	$ (129,280)

X

- Definition

Represents information about the amount of advances to parent.

+ References

No definition available.

+ Details

Name:	coi_AdvancesToParent
Namespace Prefix:	coi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents information about the allocation of overhead and other expenses from the Parent to the Company.

+ References

No definition available.

+ Details

Name:	coi_AllocationOfOverheadAndOtherExpensesFromParent
Namespace Prefix:	coi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents information about the net settlements of intercompany balances and transactions between the Company and Parent.

+ References

No definition available.

+ Details

Name:	coi_TransfersFromToParentNet
Namespace Prefix:	coi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents information about the net settlements of intercompany balances and transactions related to the change in current income tax accounts between the Company and the Parent.

+ References

No definition available.

+ Details

Name:	coi_TransfersFromToParentNetChangeInCurrentIncomeTaxAccountsa
Namespace Prefix:	coi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration