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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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