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Borrowing Arrangements (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Summary of recognized interest expense on 2010 Notes and 2006 Notes |  |
Amortization of discount | $ 684 | $ 636
Amortization of deferred financing costs | 432 | 380
Convertible Senior Subordinated Notes [Member] |  |
Summary of recognized interest expense on 2010 Notes and 2006 Notes |  |
Contractual coupon interest | 1,590 | 1,590
Amortization of discount | 684 | 636
Amortization of deferred financing costs | 180 | 180
Total interest expense | $ 2,454 | $ 2,406

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