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

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-Section S99
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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
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Other Financial Statement Disclosures - Long Term Debt, Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Apr. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Gain on extinguishment of debt		$ 1,787		$ 0	$ 2,364	$ 0
Senior Notes [Member] \| 5% Senior Notes due September 2017 and 7.875% Senior Notes due August 2019 [Member]
Debt Instrument [Line Items]
Early repayment of debt			$ 15,900
Aggregate amount of debt paid	$ 21,400		16,500
Gain on extinguishment of debt		$ 1,200	$ 600
Senior Notes [Member] \| 5% Senior Notes, due September 2017 [Member]
Debt Instrument [Line Items]
Stated rate	5.00%	5.00%	5.00%		5.00%		5.00%
Senior Notes [Member] \| 7.875% Senior Notes, due August 2019 [Member]
Debt Instrument [Line Items]
Aggregate amount of debt paid	$ 10,000
Stated rate	7.875%	7.875%	7.875%		7.875%		7.875%
Gain on extinguishment of debt		$ 600