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Debt and Credit Arrangements Convertible Notes (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Debt Instrument [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights 84.96    
Interest accretion of convertible notes discount $ 2,587,000 $ 2,391,000  
Financing costs amortization 326,000 326,000  
Minimum Trading Days Required During Thirty Consecutive Trading Days Where Last Reported Sales Price Is At Least 130 Percent Of Conversion Price 20 days    
Maximum Days After Any Five Trading Day Period In Which Trading Price Was Less Than 97 Percent Of Last Reported Sale Price of Common Stock Times Conversion Rate 5 days    
Share Price $ 79.45    
Debt Instrument, Convertible, If-converted Value in Excess of Principal 37,737,000    
Percent Of The Principal Amount Of The Convertible Notes Plus Accrued Interest To Be Purchased By The Company Subject Company Undergoing A Fundamental Change 100.00%    
Convertible notes conversion feature 0   56,563,000
Assets And Liabilities For Which Fair Value Only Is Disclosed, Fair Value Of Convertible Notes As A Percentage Of Par Value 135.00%   154.00%
Convertible Notes Payable [Member] | Convertible Notes, Due 2018 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 250,000,000    
Debt Instrument, Interest Rate, Stated Percentage 2.00%    
Debt Instrument, Convertible, Effective Interest Rate 7.90%    
Number Of Shares Of Convertible Debt Hedged And Capped Call 3,622    
Class of Warrant or Right, Exercise Price of Warrants or Rights 84.96    
Proceeds from Issuance of Warrants 48,848,000    
Net Cost Of Convertible Note Hedge And All Capped Transactions 17,638,000    
Convertible Debt 170,885,000    
Carrying amount of equity component 79,115,000    
Percentage Used As Debt Rate For Present Value Of Cash Flows 7.90%    
Unamortized discount 53,976,000   56,563,000
Debt Instrument, Convertible, Interest Expense 3,837,000 3,641,000  
Interest Expense, Debt, Excluding Amortization 1,250,000 1,250,000  
Interest accretion of convertible notes discount 2,587,000 2,391,000  
Deferred Finance Costs, Gross 7,277,000    
Financing costs amortization 178,000 178,000  
Minimum Percentage Of Conversion Price Of Convertible Notes On 20 Of 30 Trading Days For The Options To Be Convertible 130.00%    
Debt Instrument, Convertible, Conversion Price $ 69.03    
Convertible Notes Principal Amount Denominator For Trading Price 1,000    
Maximum Allowable Percentage Of The Product Of Last Reported Sale Price of Common Stock And Conversion Rate For Convertible Notes Payable 97.00%    
Percent Of The Principal Amount Of The Convertible Notes Plus Accrued Interest To Be Purchased By The Company Subject Company Undergoing A Fundamental Change 100.00%    
Current convertible notes 196,024,000   193,437,000
Convertible notes conversion feature     56,563,000
Senior Term Loan Due 2017 [Member] | Senior Credit Facility [Member]
     
Debt Instrument [Line Items]      
Financing costs amortization 148,000 148,000  
Additional Paid-in Capital [Member] | Convertible Notes Payable [Member] | Convertible Notes, Due 2018 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs, Gross 2,303,000    
Carrying Amount, Deferred Financing Fees [Member] | Convertible Notes Payable [Member] | Convertible Notes, Due 2018 [Member]
     
Debt Instrument [Line Items]      
Deferred Finance Costs, Gross $ 4,974,000