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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 115,052	$ 234,802
Long-term Debt, Current Maturities	(1,778)	(5,427)
Long-term Debt, Excluding Current Maturities	113,274	229,375
Line of Credit [Member] \| Senior Secured Revolving Credit Facility October 2015 [Member]
Debt Instrument [Line Items]
Long-term Debt	97,959	217,494
Convertible Subordinated Debt [Member] \| Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Long-term Debt	10,316	10,009
Notes Payable, Other Payables [Member] \| Other Notes and Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 6,777	$ 7,299

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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