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Financial Instruments (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Private Placement, Notes [Member]
Jun. 24, 2013
Credit Agreement [Member]
Jun. 30, 2013
Credit Agreement [Member]
Dec. 31, 2010
Credit Agreement [Member]
Jun. 30, 2013
Credit Agreement [Member]
Minimum [Member]
Jun. 30, 2013
Credit Agreement [Member]
Maximum [Member]
Jun. 28, 2013
Credit Agreement [Member]
Interest Rate Swap [Member]
Apr. 16, 2013
Credit Agreement [Member]
Interest Rate Swap [Member]
Jun. 30, 2013
Credit Agreement [Member]
Interest Rate Swap [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]
Jun. 30, 2013
Convertible Notes [Member]
Debt Instrument [Line Items]                            
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   168,500,000                        
Amount of credit facility       330,000,000 390,000,000                  
Amount of credit facility outstanding       164,000,000                    
Additional amount that can be borrowed on facility       166,000,000                    
Notional amount                   105,000,000 110,000,000 105,000,000    
Fixed interest rate in swap                     1.414% 2.04%    
LIBOR spread     1.375%     1.25% 1.875% 0.19% 0.28%          
Effective annual rate                   3.415%        
Maximum leverage ratio allowed 3.50                          
Minimum interest coverage ratio required 3.00                          
Leverage ratio 1.75                          
Interest coverage ratio 8.57                          
Percentage of principal redeemed                         100.00%  
Cash paid to redeem convertible senior notes                         28,400,000  
Number of warrants sold                           4.1
Strike price of warrants                           52.25
Date warrants can be exercised                           Jun. 15, 2013
Final expiration date                           Sep. 10, 2013
Notes hedge and warrant transactions, net cost                           $ 14,700,000