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2.25% Convertible Senior Notes Due 2019 (Tables)
 6 Months Ended
Jun. 30, 2015
2.25% Convertible Senior Notes Due 2019 [Abstract]  
Carrying Amounts of Liability and Equity Components

 

 

 

 

 

 

 

 

 

June 30, 2015

 

December 31, 2014

 

 

(In thousands)

Amount of the equity component (1)

$
45,808 

 

$
45,808 

 

 

 

 

 

 

2.25% convertible senior notes due 2019

$
330,000 

 

$
330,000 

Unamortized debt discount (2)

 
(38,588)

 

 
(42,844)

Unamortized transaction costs related to the debt component

 
(5,933)

 

 
(6,526)

Contractual coupon interest accrual

 
3,713 

 

 
3,733 

Contractual coupon interest payment

 
(3,713)

 

 
(3,733)

Net carrying amount

$
285,479 

 

$
280,630 

 

(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.

 

Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount

 

 

 

 

 

 

 

Six-month period ended June 30, 2015

 

Three-month period ended June 30, 2015

 

 

 

 

 

(In thousands)

 

(In thousands)

Contractual coupon interest expense

$
3,713 

 

$
1,857 

Amortization of debt discount

 
4,256 

 

 
2,128 

Amortization of debt issuance costs

 
593 

 

 
294 

Total interest expense related to Notes

$
8,562 

 

$
4,279