Convertible Senior Notes Narrative (Details) - USD ($) |
3 Months Ended | 12 Months Ended | ||||
---|---|---|---|---|---|---|
Sep. 30, 2014 |
Dec. 31, 2014 |
Jun. 30, 2015 |
Nov. 14, 2014 |
Nov. 30, 2005 |
May. 31, 2005 |
|
3.625% Convertible Senior Notes Due 2025 [Member] | ||||||
Debt Instrument [Line Items] | ||||||
Aggregate principal amount | $ 450,000 | $ 0 | $ 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 | 93,280,000 | $ 93,280,000 | $ 300,000,000.0 | |||
Interest rate on notes | 5.875% | 5.875% | ||||
Tender Offer Repurchase Amount - Face Value | 80000 | |||||
Conversion price for convertible senior notes (in dollars per share) | $ 24.61 | |||||
Tender Offer Repurchase Amount | 25200 | |||||
Debt Instrument, Repurchased Face Amount | $ 46,100,000 | |||||
Debt Instrument, Repurchase Amount | $ 19,100,000 | |||||
Gains (Losses) on Extinguishment of Debt | $ 12,100,000 |