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Long-Term Debt (Senior Convertible Notes) (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nov. 30, 2011
Senior Convertible Notes [Member]
Dec. 31, 2012
Senior Convertible Notes [Member]
Dec. 31, 2011
Senior Convertible Notes [Member]
Dec. 31, 2012
Minimum [Member]
Senior Convertible Notes [Member]
Dec. 31, 2012
Maximum [Member]
Senior Convertible Notes [Member]
Debt Instrument [Line Items]                
Long-term debt outstanding $ 200,000,000 $ 200,000,000   $ 200,000,000        
Debt Instrument, Maturity Date       Dec. 01, 2018        
Proceeds from issuance of debt, net of issuance costs (295,000) 198,060,000 0 197,800,000        
Debt issuance costs, net       2,200,000        
Payment of debt issuance costs         300,000      
Conversion rate of convertible notes to common stock shares         11.6553      
Common stock, par value $ 0.001 $ 0.001     $ 0.001      
Conversion rate of convertible notes, principal amount         1,000      
Initial conversion price per share of common stock         $ 85.80      
Debt instrument, convertible into shares, earliest date         May 28, 2012      
Debt instrument, redeemable notes purchase price, percentage         120.00%      
Weighted average price of common stock         $ 111.54      
Trading days prior to conversion date required for conversion             50 65
Senior notes, fair value         $ 212,500,000 $ 206,500,000