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Debt and Credit Arrangements Convertible Notes (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Current Maturities Of Long Term Debt Including Short Term Debt $ 244,330,000 [1]   $ 244,330,000 [1]   $ 6,487,000
Interest accretion of convertible notes discount     10,027,000 $ 9,268,000  
Financing costs amortization 321,000 $ 321,000 963,000 963,000  
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member]          
Debt Instrument [Line Items]          
Current Maturities Of Long Term Debt Including Short Term Debt 238,142,000   238,142,000    
Long-term Debt, Gross         228,115,000
Debt Instrument, Face Amount $ 250,000,000   $ 250,000,000    
Debt Instrument, Interest Rate, Stated Percentage 2.00%   2.00%    
Debt Instrument, Convertible, Effective Interest Rate 7.90%   7.90%    
Number Of Shares Of Convertible Debt Hedged And Capped Call 3,622   3,622    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 84.96   $ 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, Noncurrent         228,115,000
Unamortized Debt Issuance Expense $ 592,000   592,000   1,125,000
Unamortized discount 11,858,000   11,858,000   $ 21,885,000
Debt Instrument, Convertible, Interest Expense 4,658,000 4,400,000 13,777,000 13,018,000  
Interest Expense, Debt, Excluding Amortization 1,250,000 1,250,000 3,750,000 3,750,000  
Interest accretion of convertible notes discount 3,408,000 3,150,000 10,027,000 9,268,000  
Deferred Finance Costs, Gross 7,277,000   7,277,000    
Financing costs amortization $ 178,000 $ 178,000 $ 533,000 $ 533,000  
Debt Instrument, Convertible, Threshold Consecutive Trading Days     20 days    
Debt Instrument, Convertible, Threshold Trading Days     30    
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger     130.00%    
Debt Instrument, Convertible, Conversion Price $ 69.03   $ 69.03    
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    
Convertible Notes Principal Amount Denominator For Trading Price $ 1,000   $ 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%   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%   100.00%    
Debt Instrument, Fair Value Disclosure, Narrative     The fair value of the Convertible Notes was approximately 99% of their par value and approximately 96% of their par value as of September 30, 2017 and December 31, 2016, respectively    
Liability Component [Member] | Convertible Notes, Due 2018 [Member] | Convertible Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 170,885,000   $ 170,885,000    
Deferred Finance Costs, Gross 4,974,000   4,974,000    
Equity Component [Member] | Convertible Notes, Due 2018 [Member] | Convertible Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 79,115,000   79,115,000    
Deferred Finance Costs, Gross $ 2,303,000   $ 2,303,000    
[1] Current maturities includes $238,142 current convertible notes at September 30, 2017.