Debt and Other Financing (Details Textual 1) (USD $)	3 Months Ended		12 Months Ended				12 Months Ended							12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 7.875% Senior Notes [Member]	Dec. 31, 2010 7.875% Senior Notes [Member]	Dec. 31, 2011 7.875% Senior Notes [Member] Beginning August 14, 2014 [Member]	Dec. 31, 2011 7.875% Senior Notes [Member] Thru August 15, 2013 [Member]	Dec. 31, 2011 7.875% Senior Notes [Member] Prior to August 15, 2014 [Member]	Dec. 31, 2011 6.50% Convertible Senior Notes, net of unamortized discounts [Member] Y	Dec. 31, 2010 6.50% Convertible Senior Notes, net of unamortized discounts [Member]	Dec. 31, 2009 6.50% Convertible Senior Notes, net of unamortized discounts [Member]	Dec. 31, 2008 6.50% Convertible Senior Notes, net of unamortized discounts [Member]	Dec. 31, 2010 2009 Amended and Restated Credit Facility [Member]	Dec. 31, 2011 2010 Credit Facility [Member]	Dec. 31, 2010 2010 Credit Facility [Member]	Dec. 31, 2011 Other financing arrangements [Member]	Dec. 31, 2010 Other financing arrangements [Member]
Debt Instrument [Line Items]
Borrowings under this credit facility	$ 293,842,000		$ 300,769,000	$ 293,842,000											$ 7,700,000	$ 0
Additional availability under program															335,900,000	342,800,000	11,700,000	9,300,000
Interest rate terms															The interest rate under the 2010 Credit Facility is the sum of (A) either (1) LIBOR or (2) the higher of the Federal Funds Rate plus 0.5%, the Prime Rate, or LIBOR plus 1.0% and (B) a variable margin based on the Company’s leverage
Outstanding term loan, early principal payment														83,600,000
Unamortized debt issuance cost written off to interest expense														2,300,000
Outstanding term loan, remaining principal payment														147,800,000
Outstanding revolving borrowings, principal payment														75,500,000
Term of credit facility															5 years
Debt facility amount																350,000,000	16,400,000	12,900,000
Maturity date															Aug. 24, 2015
Debt instrument, basis spread on variable Federal Funds Rate															0.50%
Debt instrument, basis spread on variable LIBOR Rate															1.00%
Debt instrument, basis spread on variable Treasury Rate									0.50%
Redemption Terms					It may redeem some or all of the Senior Notes beginning August 15, 2014, at prices ranging from 100% to 103.938% of the principal amount. In addition, through August 15, 2013, we may redeem up to 35% of the Senior Notes at a price equal to 107.875% of the principal amount using proceeds of certain equity offerings. We may also redeem some or all of the Senior Notes prior to August 15, 2014, at a price equal to the principal amount plus a defined applicable premium. The applicable premium on any redemption date is the greater of 1.0% of the principal amount of the note or the excess of (1) the present value at such redemption date of the redemption price of the note at August 15, 2014, plus all required interest payments due on the note through August 15, 2014, computed using a discount rate equal to the Treasury Rate as of the redemption date plus 50 basis points; over (2) the principal amount of the note.
Interest rate															3.00%
Securitization of credit facility, Domestic															100.00%
Securitization of credit facility, Foreign															65.00%
Fixed charge coverage ratio minimum															1.35
Fixed charge coverage ratio maximum															1.00
Leverage ratio minimum															3.50
Leverage ratio maximum															1.00
Restricted payments, Annual															30,000,000
Restricted payments, Maximum															60,000,000
Debt amount issued						250,000,000							172,500,000
Debt stated interest rate					7.875%					6.50%
Debt Instrument, Frequency of Periodic Payment					Interest payable semi-annually in arrears on February 15th and August 15th of each year					Interest payable semi-annually in arrears on February 15th and August 15th of each year
Maturity date					Aug. 15, 2018					Aug. 15, 2013
Initial base conversion rate										30.9253
Initial base conversion price										$ 32.34
Debt instrument face amount repurchased										700,000	136,700,000
Losses on extinguishment of debt	3,700,000	19,300,000	45,000	23,001,000						100,000	13,100,000			9,900,000
Principal amount outstanding										35,100,000	35,800,000
Effective interest rate										9.50%
Contractual interest										2,300,000	9,000,000	11,200,000
Amortization of liability discount										900,000	3,000,000	3,400,000
Remaining liability discount amortization period										1.6
Unamortized liability discount										1,600,000	2,500,000
Carrying amount of equity component										$ 7,500,000	$ 7,500,000
Minimum redemption price as percentage of principal amount							100.00%
Maximum redemption price as percentage of principal amount							103.938%
Redeemable Percentage of Senior Notes Maximum								35.00%
Redemption price as percentage of principal amount								107.875%
Minimum premium percentage of principal amount									1.00%