Long-Term Debt Convertible Debt (Details) (USD $)	3 Months Ended	12 Months Ended					1 Months Ended	6 Months Ended	12 Months Ended			72 Months Ended		12 Months Ended
	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member] Maximum [Member]	Dec. 31, 2013 Convertible Subordinated Debt [Member]	Jan. 31, 2014 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Jun. 30, 2013 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2013 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [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 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Feb. 17, 2007 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2013 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member] Minimum [Member]
Debt Instrument [Line Items]
Cash Restructuring Limit Related to a Credit Agreement					$ 15,000,000
Debt Instrument, Unamortized Discount		2,709,000							2,709,000	3,341,000		3,341,000
Effective Interest Rate												11.50%
Principal Amount													135,000,000
Interest Rate									4.125%
Principal in Excess of If-converted Value									851,000
Repurchased and Extinguished Principal									500,000	63,351,000
Principal amount of liability component									13,350,000	13,350,000		13,350,000
Gains (Losses) on Extinguishment of Debt	(312,000)	0	(312,000)	(24,200,000)					(312,000)	(24,200,000)
Write off of Deferred Debt Issuance Cost							1,070,000	1,216,000	11,000	1,554,000
Conversion Ratio									40.3323
Conversion Ratio Principal Amount									1,000
Initial Conversion Price						$ 24.79			$ 24.79
Interest Expense									633,000	577,000	1,565,000
Interest Paid		$ 4,046,000	$ 8,866,000	$ 10,789,000					$ 551,000	$ 560,000	$ 1,670,000
Conversion Price									$ 32.23
Conversion Price Premium									30.00%
Trading Days Common Stock above Conversion Price														20 days
Period of Consecutive Trading Days Preceding the Date on which the Notice of Conversion is Given									30 days
Number of equity instruments upon conversion of convertible debt									539,000