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Financial Instruments (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Private Placement, Notes [Member]
Dec. 23, 2013
Credit Agreement [Member]
Dec. 31, 2013
Credit Agreement [Member]
Oct. 16, 2013
Credit Agreement [Member]
Dec. 31, 2010
Credit Agreement [Member]
Dec. 31, 2013
Credit Agreement [Member]
Minimum [Member]
Dec. 31, 2013
Credit Agreement [Member]
Maximum [Member]
May 20, 2013
Credit Agreement [Member]
Interest Rate Swap [Member]
Jul. 16, 2010
Credit Agreement [Member]
Interest Rate Swap [Member]
Mar. 15, 2013
Convertible Notes [Member]
Dec. 31, 2013
Convertible Notes [Member]
Dec. 31, 2012
Convertible Notes [Member]
Debt Instrument [Line Items]                              
Principal payments due in 2014 $ 3,800,000                            
Principal payments due in 2015 50,000,000                            
Principal payments due in 2017 50,000,000                            
Principal payments due in 2018 200,000,000                            
Principal payments due 2019 and thereafter 0                            
Interest paid 16,100,000 18,400,000 20,200,000                        
Debt issued       150,000,000                     28,437,000
Interest rate       6.84%                   2.25%  
Maturity date       Oct. 25, 2017                      
Year of maturity           2018               2026  
Payment required on October 25, 2013       50,000,000                      
Payment required on October 25, 2015       50,000,000                      
Fair value of long-term debt       114,500,000                      
Amount of credit facility           330,000,000   390,000,000              
Amount of credit facility outstanding           200,000,000                  
Additional amount that can be borrowed on facility           130,000,000                  
Notional amount                     110,000,000 105,000,000      
Fixed interest rate in swap                     1.414% 2.04%      
LIBOR spread         1.375%       1.25% 1.875%          
Effective annual rate           3.415%                  
LIBOR rate           0.17% 0.25%                
Maximum leverage ratio allowed 3.50                            
Minimum interest coverage ratio required 3.00                            
Leverage ratio 1.78                            
Interest coverage ratio 8.85                            
Percentage of principal redeemed                         100.00%    
Cash paid to redeem convertible senior notes                         28,400,000    
Note hedge and warrant, net cost                           $ 14,700,000  
Strike price of warrants                           52.25