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Long-Term Debt (Details Textuals)
9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
USD ($)
Mar. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2010
Sep. 30, 2011
US Credit Agreement Revolving Credit Line [Member]
USD ($)
Dec. 31, 2010
US Credit Agreement Revolving Credit Line [Member]
USD ($)
Sep. 30, 2011
US Credit Agreement Revolving Credit Line [Member]
Minimum [Member]
Sep. 30, 2011
US Credit Agreement Term Loan [Member]
USD ($)
Dec. 31, 2010
US Credit Agreement Term Loan [Member]
USD ($)
Sep. 30, 2011
US Credit Agreement Term Loan [Member]
Maximum [Member]
Sep. 30, 2011
UK Credit Agreement Revolving Credit Line [Member]
USD ($)
Sep. 30, 2011
UK Credit Agreement Revolving Credit Line [Member]
GBP (£)
Dec. 31, 2010
UK Credit Agreement Revolving Credit Line [Member]
USD ($)
Sep. 30, 2011
UK Credit Agreement Revolving Credit Line [Member]
Maximum [Member]
Sep. 30, 2011
UK Credit Agreement Revolving Credit Line [Member]
Minimum [Member]
Sep. 30, 2011
UK Credit Agreement Term Loan [Member]
USD ($)
Dec. 31, 2010
UK Credit Agreement Term Loan [Member]
USD ($)
Sep. 30, 2011
UK Credit Agreement Overdraft Line Of Credit [Member]
GBP (£)
Sep. 30, 2011
UK Credit Agreement Overdraft Line Of Credit [Member]
USD ($)
Dec. 31, 2010
UK Credit Agreement Overdraft Line Of Credit [Member]
USD ($)
Sep. 30, 2011
7.75% senior subordinated notes due 2016 [Member]
USD ($)
Dec. 31, 2010
7.75% senior subordinated notes due 2016 [Member]
USD ($)
Dec. 31, 2006
7.75% senior subordinated notes due 2016 [Member]
USD ($)
Sep. 30, 2011
3.5% senior subordinated convertible notes due 2026 [Member]
Mar. 31, 2011
3.5% senior subordinated convertible notes due 2026 [Member]
Sep. 30, 2011
3.5% senior subordinated convertible notes due 2026 [Member]
USD ($)
Dec. 31, 2010
3.5% senior subordinated convertible notes due 2026 [Member]
USD ($)
Sep. 30, 2011
Mortgages [Member]
USD ($)
Dec. 31, 2010
Mortgages [Member]
USD ($)
Sep. 30, 2011
UK Credit Agreement [Member]
USD ($)
Sep. 30, 2011
UK Credit Agreement [Member]
GBP (£)
Sep. 30, 2011
US Credit Agreement Revolver Borrowing [Member]
USD ($)
Sep. 30, 2011
US Credit Agreement Letter of Credit [Member]
USD ($)
Long-Term Debt (Textuals) [Abstract]                                 
Maximum credit available under US and UK credit agreement    $ 375,000,000  $ 134,000,000   £ 92,000,000                    $ 10,000,000
Line of credit basis spread on variable rate      2.50%2.50% 2.75%   3.00%1.10%  1.75%               
Debt instrument redemption rate of principal                    100.00%    100.00%       
Debt instrument redemption rate of principal exceeded                         120.00%       
Incremental interest rate for uncollateralized borrowings in excess of maximum limit    0.10%                            
Term loan outstanding under credit agreement       134,000,000                     72,032,00046,216,000120,000,0001,250,000
Demand over draft line of credit                 10,000,000               
Debt Instrument, Face Amount                      375,000,000          
Convertible notes prior period                         6 months       
Senior subordinated convertible notes, Interest rate3.50%  3.50%                7.75% 7.75%  3.50%       
Outstanding Convertible senior notes 87,278,000                       63,324,000       
Conversion rate of convertible notes                         42.7796       
Conversion principal amount                         1,000       
Conversion price per share                         $ 23.38       
Closing price of common stock                         $ 28.05       
Conversion Period                         10 days       
Payment of cash, common stock or a combination of two, if conversion value exceed                         1,000,000       
Annual effective interest rate on liability component                       3.50%8.25%        
Long-term Debt$ 851,569,000 $ 779,878,000 $ 120,000,000$ 0 $ 134,000,000$ 134,000,000 $ 67,020,000 $ 54,597,000  $ 0$ 5,505,000 $ 5,012,000$ 7,116,000$ 375,000,000$ 375,000,000   $ 63,324,000$ 148,884,000$ 77,914,000$ 46,052,000    
Dates on which holders of the convertible notes may require the company to purchaseApril 1, 2011, April 1, 2016 or April 1, 2021