XML 31 R104.htm IDEA: XBRL DOCUMENT v2.4.0.6
Long-Term Debt (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2012
7.125% Notes, due May 2016 [Member]
Oct. 03, 2012
7.125% Notes, due May 2016 [Member]
Dec. 31, 2012
5.375 Percent Notes [Member]
Oct. 03, 2012
5.375 Percent Notes [Member]
Dec. 31, 2012
Letter of Credit [Member]
Dec. 31, 2011
Letter of Credit [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Nov. 21, 2011
Revolving Credit Facility [Member]
Dec. 31, 2012
Maximum [Member]
Revolving Credit Facility [Member]
Dec. 31, 2012
Minimum [Member]
Revolving Credit Facility [Member]
Long-Term Debt (Textual) [Abstract]                        
Line of credit facility, maximum borrowing capacity                   $ 350,000,000    
Debt instrument maturity date         Oct. 15, 2020       Nov. 21, 2016      
Federal fund rate Spread                     1.25% 0.25%
Spread, Euro-rate                     2.25% 1.25%
Outstanding Amount of Debt       200,000,000   250,000,000            
Proceeds from note offering, net of original issue discount 250,000,000 95,000,000     245,100,000              
Letter of credit outstanding             5,200,000 4,600,000        
Percentage of aggregate principal amount of outstanding 5.375% 7.125% 7.125% 7.125% 5.375% 5.375%            
Long-Term Debt (Additional Textual) [Abstract]                        
Margin over federal fund rate 0.50%                      
Margin over Euro-rate 1.00%                      
Redemption rate 102.375%                      
Redemption premium 4,800,000                      
Write-off of the related unamortized deferred financing fees 1,900,000                      
Unamortized deferred debt issuance costs $ 4,800,000