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Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2014
item
Dec. 31, 2013
Jun. 15, 2011
Jun. 30, 2014
Alternate Base Rate Loans
Minimum [Member]
Jun. 30, 2014
Alternate Base Rate Loans
Maximum [Member]
Jun. 30, 2014
Eurodollar Loans
Minimum [Member]
Jun. 30, 2014
Eurodollar Loans
Maximum [Member]
Jun. 13, 2011
7.75% Senior Notes due 2019
Jun. 30, 2014
7.75% Senior Notes due 2019
Dec. 31, 2011
7.75% Senior Notes due 2019
Maverick Companies
Feb. 15, 2011
7.75% Senior Notes Due 2019 on and after February 15 2015
Feb. 15, 2011
7.75% Senior Notes Due 2019 Prior To February 15 2014
Jun. 30, 2014
7.75% Senior Notes Due 2022
Jun. 30, 2014
11.625% Senior Notes Due 2014
Jun. 30, 2014
7.125% Senior Notes Due 2016
Jun. 30, 2014
March 31, 2014 and June 30, 2014 [Member]
Jun. 30, 2014
September 30, 2013 through June 30, 2014 [Member]
Jun. 30, 2014
September 30, 2014 and each fiscal quarter thereafter [Member]
Debt Instrument [Line Items]                                    
Issuance of senior notes               $ 200.0 $ 275.0         $ 464.6        
Interest rate                 7.75%       7.75% 11.625% 7.125%      
Debt Instrument, Maturity Date                 Feb. 15, 2019       Oct. 15, 2022          
Deb tInstrument Maturity Year                           2014 2016      
Senior notes, aggregate principal amount               475.0         300.0          
Debt instrument, purchase price as a percentage of principal amount               101.00% 100.00%                  
Portion of the net proceeds from the offering to be funded                   186.3                
Debt instrument, redemption price                 100.00%       100.00%          
Percent redeemable                 35.00%       35.00%          
Redemption price percentage of senior note                 107.75%       107.75%          
Minimum amount outstanding after redemption                 65.00%       65.00%          
Maximum period for redemption on senior note (in days)                 90 days       90 days          
Debt instrument, repurchase price, percentage on principal amount plus accrued and unpaid interest                 101.00%       101.00%          
Secured revolving credit facility 250.0   225.0               165.0 30.0            
Increase in total credit 100.0                                  
Marginal interest rate       1.50% 2.50% 2.50% 3.50%                      
Commitment fee 0.50%                                  
Minimum consolidated interest coverage ratio floor 2.50                                  
Maximum consolidated leverage ratio ceiling                               4.25   4.00
Maximum consolidated senior secured leverage ratio                                 1.75 2.00
Revolver                                      
Letters of credit outstanding under the Credit Agreement 37.7                                  
Total Available Credit under the agreement $ 212.3                                  
Minimum Debt service coverage ratio 1.05