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2.25% Convertible Senior Notes Due 2019 (Carrying Amounts of Liability and Equity Components) (Details) - 2.25% Convertible Senior Notes Due 2019 [Member] - USD ($) | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Amount of the equity component | [1] | $ 45,808,000 | $ 45,808,000 |
2.25% convertible senior notes due 2019 |  | 330,000,000 | 330,000,000 | $ 330,000,000
Unamortized debt discount | [2] | (38,588,000) | (42,844,000) |
Unamortized transaction costs related to the debt component |  | (5,933,000) | (6,526,000) |
Contractual coupon interest accrual |  | 3,713,000 | 3,733,000 |
Contractual Coupon Interest Payment |  | (3,713,000) | (3,733,000) |
Net carrying amount |  | $ 285,479,000 | $ 280,630,000 |
[1] | Net of $1,177 thousands of transaction costs related to the equity component of the Notes.
[2] | As of June 30, 2015, the remaining period over which the unamortized debt discount will be amortized is 4 years.

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