Quarterly report pursuant to Section 13 or 15(d)

Debt (Narrative) (Details)

v2.4.0.8
Debt (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2014
Apr. 30, 2014
Dec. 31, 2013
May 31, 2013
Apr. 30, 2013
May 31, 2011
May 31, 2011
5.75% Senior Notes [Member]
Jun. 30, 2014
5.75% Senior Notes [Member]
Nov. 30, 2012
5.75% Senior Notes [Member]
Apr. 30, 2014
4.75% Percent Senior Notes [Member] [Member]
Jun. 30, 2014
4.75% Percent Senior Notes [Member] [Member]
Debt Instrument [Line Items]                      
Senior notes, at par $ 725,000   $ 425,000       $ 250,000   $ 175,000 $ 300,000  
Fair value of interest rate swap agreements 9,506   9,576         8,935     571
Debt Instrument, Interest Rate, Stated Percentage             5.75%     4.75%  
Senior notes due date             Jun. 01, 2017     May 15, 2022  
Senior notes, effective yield             6.00%   4.29%    
Derivative, Notional Amount   300,000       250,000          
Debt Instrument, Unamortized Premium 5,166   6,052                
Variable rate of swap, percentage 3.73%                 2.52%  
Revolving credit facility, maximum borrowing capacity       500,000 350,000            
Revolving credit agreement 70,000   150,000                
Line of Credit Facility, Covenant Terms The agreement contains non-financial and financial covenants, including requirements of minimum fixed charge coverage ratios, maximum debt-to-EBITDA ratios and minimum tangible net worth. The Company is required to not exceed a maximum debt-to-EBITDA ratio of 3.0 to 1.0.                    
Revolving credit facility, due date Jun. 01, 2018                    
Line of Credit, Minimum carrying amount of unrestricted cash 100,000                    
Debt, Weighted Average Interest Rate 2.50%                    
Letters of Credit Outstanding, Amount 30,649                    
Letters of credit bore interest 0.46%                    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 159,728