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Debt (Narrative) (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Senior unsecured notes due October 2021 [Member]
Nov. 30, 2013
Senior unsecured notes due October 2021 [Member]
Oct. 31, 2013
Senior unsecured notes due October 2021 [Member]
Dec. 31, 2013
Senior secured revolving credit facility [Member]
Dec. 31, 2012
Senior secured revolving credit facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Senior secured revolving credit facility [Member]
Dec. 31, 2013
Letter of Credit [Member]
Senior secured revolving credit facility [Member]
Dec. 31, 2013
Swingline Loan [Member]
Senior secured revolving credit facility [Member]
Dec. 31, 2013
Rental equipment [Member]
Debt Instrument [Line Items]                      
Debt, face amount       $ 100,000,000.0 $ 300,000,000.0            
Debt instrument, issuance price of par, percentage       103.25%              
Debt instrument, stated interest rate         6.25%            
Proceeds from issuance of senior debt 403,250,000 0 394,000,000                
Line of credit facility, maximum borrowing capacity               600,000,000 75,000,000 25,000,000  
Line of credit facility, additional borrowing capacity                     300,000,000.0
Weighted average interest rates           2.17% 2.21%        
Total funded debt to EBITDA ratio           4.50          
Senior secured debt to adjusted EBITDA ratio           3.50          
EBITDA to interest expense ratio           3.0          
Line of credit facility, remaining borrowing capacity           $ 475,400,000