Convertible Subordinated Notes (Details) - USD ($)
shares in Thousands, $ in Thousands |
3 Months Ended |
6 Months Ended |
|
|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Dec. 31, 2014 |
Mar. 19, 2014 |
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Effect of dilutive securities, Convertible junior subordinated debentures (in shares) |
351
|
0
|
351
|
0
|
|
|
| Carrying Values of Liability and Equity Components, Convertible Subordinated Notes |
|
|
|
|
|
|
| Amortization of debt issuance costs |
|
|
$ 460
|
$ 456
|
|
|
| Convertible Subordinated Notes [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Stated interest rate percentage |
|
|
|
|
|
2.75%
|
| Carrying Values of Liability and Equity Components, Convertible Subordinated Notes |
|
|
|
|
|
|
| Convertible subordinated notes, principal amount |
$ 143,750
|
|
143,750
|
|
|
$ 143,750
|
| Unamortized discount of liability component |
(27,530)
|
|
(27,530)
|
|
$ (29,208)
|
|
| Carrying value of the liability component |
116,220
|
|
116,220
|
|
114,542
|
|
| Equity component carrying value |
17,973
|
|
17,973
|
|
$ 17,973
|
|
| Convertible subordinated notes, fair value |
173,400
|
|
173,400
|
|
|
|
| Contractual coupon interest expense |
1,000
|
$ 1,000
|
2,000
|
1,100
|
|
|
| Amortization of debt issuance costs |
100
|
100
|
238
|
138
|
|
|
| Accretion of discount, convertible subordinated notes |
$ 900
|
$ 700
|
$ 1,700
|
$ 900
|
|
|
| Effective interest rate percentage |
6.75%
|
6.75%
|
6.75%
|
6.75%
|
|
|