Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2011 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2012 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2011 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2012 Notes Payable, Other Payables [Member] Other Notes and Lease Obligations [Member]	Dec. 31, 2011 Notes Payable, Other Payables [Member] Other Notes and Lease Obligations [Member]	Dec. 31, 2012 Minimum [Member] Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Trading Days Common Stock above Conversion Price									20 days
Long-term Debt	$ 234,802	$ 265,484	$ 217,494	$ 247,063	$ 10,009	$ 9,797	$ 7,299	$ 8,624
Long-term Debt, Current Maturities	(5,427)	(5,044)
Long-term Debt, Excluding Current Maturities	$ 229,375	$ 260,440