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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Face (par) amount of the original debt instrument that was repurchased.

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The amount of cash paid for interest during the period.

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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) - Senior Notes - USD ($)	Jun. 23, 2015	Jun. 17, 2015	Dec. 31, 2016	Jul. 20, 2015	Dec. 31, 2014	Jul. 31, 2012
6.00% Senior Convertible Notes Due 2020
Debt
Stated interest rate (percent)	6.00%		6.00%
Aggregate principal amount	$ 80,000,000
Face amount of debt repurchased	15,400,000
Proceeds from notes	64,500,000
7.50% Exchange Notes and 7.50% Notes
Debt
Cash paid for interest	1,500,000
Face amount of debt repurchased	$ 30,700,000
7.50% Senior Exchange Convertible Notes
Debt
Stated interest rate (percent)	7.50%			7.50%	7.50%	7.50%
Aggregate principal amount						$ 44,500,000
Face amount of debt repurchased	$ 20,500,000
TPG Aviator, L.P. \| 6.00% Senior Convertible Notes Due 2020 \| TPG Aviator, L.P.
Debt
Stated interest rate (percent)		6.00%
Aggregate principal amount		$ 20,000,000
Ownership interest (as a percent)		43.50%
Proceeds from notes		$ 20,000,000