Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The cash inflow from a borrowing supported by a written promise to pay an obligation.

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Debt - 6.00% Senior Convertible Notes due 2020 (Details) - USD ($) $ in Millions	Jun. 23, 2015	Jun. 17, 2015	Jun. 30, 2018	Dec. 31, 2017
6.00% Senior Convertible Notes Due 2020
Debt
Stated interest rate (percent)			6.00%	6.00%
7.50% Exchange Notes and 7.50% Notes
Debt
Stated interest rate (percent)	7.50%
7.50% Senior Exchange Convertible Notes
Debt
Stated interest rate (percent)	7.50%
TPG Aviator, L.P.
Debt
Ownership percentage (percent)		43.80%
Senior Notes \| 6.00% Senior Convertible Notes Due 2020
Debt
Stated interest rate (percent)	6.00%
Aggregate principal amount	$ 80.0
Senior Notes \| 7.50% Exchange Notes and 7.50% Notes
Debt
Cash paid for interest	$ 1.5
Senior Notes \| TPG Aviator, L.P. \| 6.00% Senior Convertible Notes Due 2020
Debt
Aggregate principal amount		$ 20.0
Proceeds from notes		$ 20.0