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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

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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