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Convertible Senior Notes Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Nov. 30, 2005	May 31, 2005
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt	$ 1,037,000	$ 0	$ 1,037,000	$ 0
3.625% Convertible Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount							$ 250,000,000.0
Interest rate on notes							3.625%
5.875% Convertible Senior Notes Due 2035 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 88,780,000		$ 88,780,000		$ 93,280,000	$ 300,000,000.0
Interest rate on notes						5.875%	5.875%
Tender Offer Repurchase Amount - Face Value		4.5
Conversion price for convertible senior notes (in dollars per share)	$ 24.61		$ 24.61
Tender Offer Repurchase Amount		2.0
Gains (Losses) on Extinguishment of Debt		$ 1,000,000

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The price per share of the conversion feature embedded in the debt instrument.

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-Publisher FASB
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-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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

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-Section S99
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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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