Convertible Notes, Long-Term Debt and Credit Facility (Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Capital Leases
2013	$ 1,055
2014	678
2015	51
2016	0
2017	0
Capital lease obligations	1,784	1,642
Total Convertible Notes and Long-Term Debt
2013	9,517
2014	4,250
2015	3,622
2016	3,571
2017	11,012
Total	31,972
Convertible senior notes [Member]
Term Loan
Long term debt	5,133	99,738
Convertible Senior Notes
2013	5,188
2014	0
2015	0
2016	0
2017	0
Total	5,188
Term loan [Member]
Term Loan
2013	3,274
2014	3,572
2015	3,571
2016	3,571
2017	11,012
Long term debt	$ 25,000

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