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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Face (par) amount of the original debt instrument that was repurchased.

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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.

+ References

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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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 ($)	Jun. 23, 2015	Jun. 17, 2015	Dec. 31, 2017	Dec. 31, 2016
6.00% Senior Convertible Notes Due 2020
Debt
Stated interest rate (percent)	6.00%
Aggregate principal amount	$ 80,000,000
Proceeds from notes	64,500,000
7.50% Exchange Notes and 7.50% Notes
Debt
Cash paid for interest	1,500,000
Amount of debt repurchased	$ 30,700,000
7.50% Senior Exchange Convertible Notes
Debt
Stated interest rate (percent)	7.50%
Amount of debt repurchased	$ 15,400,000
TPG Aviator, L.P. \| 6.00% Senior Convertible Notes Due 2020
Debt
Aggregate principal amount		$ 20,000,000
Ownership interest (as a percent)		43.50%
Proceeds from notes		$ 20,000,000
Senior Notes \| 6.00% Senior Convertible Notes Due 2020
Debt
Stated interest rate (percent)			6.00%	6.00%